Yeah though I walk through the Valley of the Shadow... (Plot Spoilers, be aware)

[PhantomUnderYourDesk]

Hehe, there's a reason for the little trips to the plants were and are my favorite parts of the story. While Epsilon was pure depression for me/my character, Omicron being somehow indescribable, Zeta was... impending doom, and pure intensity as you say.

Oh, and the background music of those plants are awesome.