The second mission in Assassin's Creed: Odyssey Fate of Atlantis is known as Welcome to Elysium.
Once you teleport to Fields of Elysium, you'll appear at Persephone's court. She won't be happy to see you. You'll be attacked by opponents before you manage to get up.
During this battle, you'll encounter new opponents. They have a special power - adrenaline effect. They can freeze and drain your adrenaline. Not only you won't be able to use your abilities - your power will be used against you. The enemies can accumulate your energy and change it into a golden ray that deals a lot of damage.
During the battle, you'll be supported by Hermes. Once you defeat the opponents, talk to him. They will lead you to his ally.