It is
Good luck with Haas (when i played last time, i hoped he will be stronger than he was)
Ragebox is capped at lvl 30. In middle of game Lina's spiked ball is nice ability. It works like cavalry (more places to speed up=more damage).
P.S Try at impossible, IMHO, its worth it. And if you are interested in "hardcore" game then try to complete all game at impossible without looses (there will be combat statistic screen when you will complete game (including how many units you loose)). Believe me, it is possible (completed in such way as mage. Now working as warrior). Hint: units ressurected by nercromancy talent(!!!) after fight counts as "killed". To achieve 0 looses you need that after every fight left side of casualties screen be empty