How to Clear the Corruption in Ancient Well - Kena: Bridge of Spirits

First part, the flying stones.

Loot, and continue until you reach this courtyard.

First, you have to activate these two pillars.

For the third one, face the tree, activate the stones and get up onto the platform.

After getting up, you need to activate these stones as you did the previous two.

You can now activate the center platform.

After that, head down and defeat the enemies.

Once you cleanse the room, go down deeper into the cave.

Shoot down the blue energy and activate the forest tear.

Doing so wakes up monsters, defeats them and cleanse the corruption which opens the door next to you.

Again, you have to continue deeper into the cave, until you reach the last boss, the triple corruption.

Handle the first one - activate the stones - deal with the remaining two.