upgrade rage skills, luck or something else untold?

[Ish]

The skills people tend to talk about e.g. time back and soul drain are both with the reaper which you dont get til about midway through the game.

Sleem has glots armor but i wouldnt reccomend upgrading it, just keep it at level 1. All his other ones are mostly irrelevent and useless.

Zerok has underground blades which is semi ok if you upgrade the damage a few times and reduce the rage required

Lina's skills are all semi usefull and depend on the player

Reaper has time back which is awesome and soul drain which helps alot against big stacks. Rage drain and blackhole are ok but you wont use them much as the first 2 abilities are so good.