Colossus 7 - Hydrus | Shadow of the Colossus Walkthrough Shadow of the Colossus Guide, walkthrough

The seventh colossus is found far to the north. It's a type of an eel. Jump into the lake to begin a pre-fight cut-scene.

Start following the boss so you'll find yourself in its field of vision after making a sharp turn. The boss will encounter you (red eyes) and start swimming in your direction. It will swim to your location, so swim a little bit forward in order to not be struck by its electrified spikes. Nevertheless, you need to be close to be able to grab a hold of its tail that will appear at the end (have R2 ready). Sometimes you can simply dive to avoid being struck by the spikes.

The spikes stop glowing when you deal damage to the vital areas in front of them

When you've managed to get a hold of the tail, you'll begin to swim with the monster. When it emerges on the surface, start running in the direction of three spikes - each has a vital area right next to it. Hit each area once - the spike will stop glowing. There is a chance that your opponent will perform a long dive after destroying two spikes. In that case, release your hold on the monster and wait for an opportunity to grab a hold the beast again.

The boss' main vital point is located on its head

When you've destroyed all three you can proceed to the head to destroy the final vital spot - getting rid of it will complete the fight.