Echo Realm

Description
There are few places in a world of Marrow that cannot be reached in human form so Daniel have to use the Echo Altars(?) and transform into the Echo form. The Echo form looks like a little frog-like creature that cannot attack or use magic powers (including Healing and Luminous Orb). The world also becomes monochrome.

Most of enemies don't exist in Echo realm, so you can pass them freely. But don't relax: instead of them there are a lot of deadly Echo Denizens floating around you. Once you enter a next room, they immediately move to you. There is no way to fight them, only to run away.

In Sewage you have to meet a unique, huge Echo Denizen, that deals a horrible amount of damage.

Trivia
You can see the Unseen only in Echo form.