Seat of Infinity has many tall buildings and teleports that will take you to various places.
At the very beginning, approach Sester Genessa on the left. You can fight Hadern again in order to acquire another weapon, that is, Hammer and Chisel. After all the steps have been completed, head forward to the exit.
When you leave, you will be greeted by the first new enemy - Faceless Cleric. This opponent is very durable, and can inflict lots of damage. However, his attacks are very slow, which makes it easy to dodge his strikes. Execute powerful attacks and use Harden when attacking.
After you have defeated the opponent, there are teleports on the left and on the right. Use the right teleport. You'll be moved to a lower floor.
As soon as you move, you will notice that another Faceless Cleric is near you. Defeat him and move on. You'll encounter new opponents there. Sublime Sester is a ranged opponent that shoots twice and reloads his weapon. On the other hand, Sester of the Order is an enemy dressed in red that performs swift melee attacks but does not inflict much damage. Kill the shooter first, then the Sester of the Order. Collect the Effigy of Solomon and keep moving forward.
You'll notice another Sester of the Order. Defeat them and walk up the stairs.
There are 3 burning monuments. You must extinguish all 3 to unlock the gate, which is located higher up in front of you. On the left and right there are next Faceless Clerics. But before you go left or right, take the stairs down and walk all the way ahead.
You'll find the first burning monument there. Interact with it, but be careful, because after the monument falls down, several Wraiths will appear. After defeating them, return to the upper floor.
Then turn right and defeat the Faceless Cleric. You can go all the way to the end and defeat a couple of Sester enemies and Wraiths in order to get a Bronze Bell. Then enter the portal that will take you to another place.
There are many Wraiths here. Watch out for their stone blocks attack which looks like burned or frozen ground effect. They form columns emerging from the ground that deal damage and throw you into the air. Not far from large trees there are some mushroom spawns, both healing and providing immunity to poison. Stick to the left side where you'll notice the light.
You'll encounter another Sester there. Eliminate them one at a time, because there is a very large group of them.
Defeat the Sester of the Order shown in the picture and the Sublime Sester on the left. That's where you find the chest. By opening it you will get Quenching Acid.
Turn around and walk down the next street, and you'll encounter some ranged Sesters there.
A Faceless Cleric will stand in the middle who guards the second monument. Defeat it, but be careful as next to it are some stone columns, behind which the Sublime Sester are hidden. After defeating Faceless Cleric, wipe out all Sester enemies, then interact with the burning monument.
After activating the monument, head left towards the big tree. You will encounter an enemy with a halberd. It's the same opponent who defended the bridge at Fallgrim. Defeat him and turn right as you go up.
Again, take the stairs up, then turn left. Defeat another Faceless Cleric and enter the teleport.
On the right side there are mushroom spawns, while on the left side you will encounter more opponents. Head to the left, defeat all Wraiths and Sester enemies.
By walking forward, you will come across the enemy with halberd and an enemy with two swords on your way. A little further, you'll encounter the same opponents. Try to fight them one-on-one in order not to make the game too difficult for yourself.
Move on. You'll encounter a Faceless Cleric. Kill the enemy, collect Rotten Food. Turn left by passing near the stone columns.
In a tight passage, you'll see the encampment of primary opponents. There are four of them. After defeating them, open a chest containing the Scripture of Repent and a Golden Bell. Go back to the location where you just fought the Faceless Cleric and head up.
At the top, you'll encounter some basic opponents again - there are many of them. Defeat them. Pick up Inferior Moonshine and Glimpse of Futility, then activate the monument. This will unlock the last item to open the main gate.
Now there is nothing left but to return to the main gate. Keep moving forward and jump down. Be careful, though, as you can receive small injuries from the fall damage. At the bottom there is another enemy with two swords and a Faceless Cleric. Wipe them out and keep going.
You'll encounter more Wraiths. Eliminate them one at a time. Then go up and pick up the Scripture of Despair. Turn right and stick to the left.
On the left is a road to the top. Follow it so you will find yourself close to the Great Gate.
Once all the monuments have collapsed, step on the block, which is located in the middle. This way the gate will open. Then head up towards the open gate.
You will come across two ranged Sesters and one Sester of the Order. On the sides there are enemies with halberds. You can use the terrain to your advantage and push your opponents off with a kick.
Around the corner on the left and right you will be attacked by Faceless Clerics. There is a monument in front of you. This path leads to a further location, but before you go there, you still have rooms to explore on the left and right sides. Take care of the right side first.
On the right there is a Sester Genessa. Talk to her and develop your character if you have the required resources. Further down the hall you will see items that can be collected such as Glimpse of Futility and a Mortal Token. Then go in the opposite direction.
At the end of the hall you will find another inscription and a Weltcap spawn. Now you can take the main road.
Pick up the Scripture of Defiance and watch out for the Sester hiding on the right. Defeat them and go up the stairs.
Take your time while climbing the stairs, as they are very narrow, and you will encounter more opponents there, including another Sester. Defeat the enemy and keep going. You'll find a hole in the wall, squeeze through it and continue going up.
In the next room you will encounter 2 Sester enemies. One of them is facing you and the other is hiding behind a wall on the right. Then you'll find yourself in an arena-like location. You'll encounter a lot of opponents there. The easiest way to eliminate opponents is to use Balistazooka weapon.
Watch out for Wraiths on the sides. On the right you can collect an item - the Scripture of Ardor. Go back into the arena, there will be a passage on the right.
Walk towards the passageway visible in the picture above. Again, on the right, around the corner, there is a Sester of the Order, while in front of you you will noticed a ranged type of Sester. Wipe them out and keep going.
You still have to fight the same set of opponents in the next room. Defeat them and move on. At the top, you'll encounter another shooter. Also, Congealed Tar is located nearby. Pick it up and keep walking.
On the next floor, you'll encounter more shooters. After defeating them, pick up the Weltcap and go up.
At the top of the stairs, you'll notice four Sester, two of each kind. There are 2 teleports, one on each side, near ranged Sesters.
Enter the teleport on the right. Then you'll find yourself on the other side, not far from the main path.
On the other side you will encounter an enemy with a halberd, opponents with two swords and a Faceless Cleric. On the right there is a Sester. Wipe them out and keep going.
On the left you will spot a figure kneeling over the chasm. This is an NPC you can talk to, he will give you a task. However, it varies depending on what Shell you are currently in. While playing as Eredrim, Corvid (the NPC's name) will want you to drop him off the edge and kill him. This will give you a Glimpse of Cowardice. While playing as Harros, he will give you a task to deliver the Glimpse to his brother Thestus. He is located in the Fallgrim Tower. No matter how you will deal with this task and NPC, you can move forward.
On the floor below there are two opponents guarding an item. But before you go to them, head to the other end of the location.
There you will encounter more opponents with halberds and two swords. Defeat them and go to the end, there's another road on the right.
You're going to be attacked by one Wraith. Defeat it and climb onto the platform.
This way you can unlock a shortcut - the elevator takes you to the lower level of the location, near the second Sester Genessa. If you want, you can talk to her and renew your health, but remember that your opponents will be respawned.
Pick up the item and fight with the two opponents visible in the screenshot. It's worth provoking one of them rather than fighting two at once. Keep moving forward.
Further away there are two Sester of the Order and a Faceless Cleric. Take care of Sester first, then attack the Cleric. On the right side of the hill there is a shooter. Kill him and move on. Collect the Ethereal Diapason.
A bit further you will have to defeat a duo of opponents, an enemy with halberd and an opponent with two swords. Then, there is another Sester of the Order.
On the upper floor there are two Sesters and a Faceless Cleric. Take care of the Sester enemies first, then take care of the Faceless Cleric. By going down the lower road, you'll find a Quenching Acid. Then, head up.
At the top, you will once again fight the Sester of the Order and the ranged variant of Sester. There are four of them. After defeating them, pick up the Weltcap and move on.
Defeat the two Sester and collect the Effigy of Solomon. By coming down, you'll find yourself in a new location. There is also a Faceless Cleric at the bottom. Defeat the opponent and go ahead.
Stick to the left side of the archives. You'll find a Slurry of Tar and a teleport there.
On the right there is another inscription. Then go ahead and turn left.
There is a large Sester Genessa located there. Talk to her. Improve your class or buy things from her. Then go to the chalice and drink its contents. Now you'll be fighting the last of the three main bosses, called Crucix, the Twiceborn. Be careful, because by drinking the contents of the goblet, you will not automatically start the boss fight, as you will fall down the floor below, receiving heavy damage from the fall. You can change that by having a Recollection of Knowledge that allows you to execute Harden in the air. A description of the fight against Crucix, the Twiceborn can be found on a separate page of our game guide to Mortal Shell.
Once you've defeated Crucix, go to the body next to the skull, interact, and you'll get the last key item you need to deliver to The Old Prisoner. As before, with this item in your inventory, the location will become darker and have different opponents.
Talk to Sester Genessa and head back to the starting point of this location. Going forward, you will encounter the first opponents, wraiths. Beat them and go to the first portal. Then, you will see a shooter on the left, Sester of the Order in the front, and a Faceless Cleric at the teleport. There are two more Sesters next to the pillars on the right and left. Deal with the shooter first, then the Sester, and finally the Cleric. After defeating them, go through the teleport.
After passing through the teleport, you will encounter the same set of opponents again - Sester, the ranged enemy, and Faceless Cleric. Defeat them, pick up the Weltcap, and go down. However, be careful of the wraiths that appear in front of you. At the end of the road, you'll notice a teleport - a Sester of the Order is there. Go through the teleport instead of fighting her.
As you teleport, you'll notice more Sesters. Fighting against these opponents can be difficult - there are 3 Sesters, followed by a Faceless Cleric, a Brether of Synod, and Sublime Brether. If you feel up to it, eliminate them one at a time. If you don't, just run along, keeping away from them.
Going further, the only way is over the bridge in the middle. There are 8 enemies equipped with ranged weapons at the end of the bridge. They will start firing at you when you get very close to them. You can shoot them with Ballistazooka, but not all of them, of course, as it's a waste of ammunition. However, killing at least 3 will make it a lot easier to cross the bridge. You can also quickly run into them, kill the first two that are closest to the middle, use Harden, and wait for the moment when they all reload. Then kill two more and repeat. There's also the option of running through them. Just remember to run left, the path to the right leads to nowhere, and the path leading straight is blocked. You have to go toward the shortcut you have unlocked earlier.
Going left, you will encounter another Sester and Brether of Synod. Instead of fighting them, turn right and take a shortcut. However, beware of shooters who are near to the shortcut.
There are four wraiths at the bottom - eliminate them one by one. Approach the Sester on the right to unlock the checkpoint. Turn left and head to the main gate.
As you go further, you will encounter 2 Faceless Clerics. There are also 2 Sester of the Order and two shooters near the gate. Take care of the shooters standing in the middle of the pass and keep going down.
At the lower floor, you will encounter a Brether of Synod and a Sublime Brether. Go down two floors and turn right. However, watch out for the wraiths that will appear before you.
Defeat the opponent and go ahead. Defeat the Faceless Cleric, Sester of the Order and Sublime Sester. Enter through a portal located at the end of the path.
After that, beat two Faceless Clerics and head left to the starting location. Talk to Sester Genessa and head to Fallgrim Tower to hand over the last Gland, a key item.