[maltz]

After finishing the game on normal (warrior) and hard (paladin), I have the following conclusions:

(1) For warriors: you will have too many Might runes anyway, so you will end up maxing this skill. Also, since your rage accumulates quickly, you will have lots of EXP for the rage spirits anyway, too.

(2) For non-warriors: you will have a shortage of Might runes, so spend these precious red stones on something else. Your rage points are too little to level the spirits up fully, so the extra one or two levels won't help too much anyway.

On high difficulty, your priority on rage skills shifts to troop conservation (as you can't kill them off fast enough), so Stone Wall, Glot's Armor, Time Back, Ice Thorn becomes much more frequently used than Underground Spikes, Evil Shoal/Poisoned Rain, Ice Ball and Black Hole. The latter rage skills require a high skill level to be effective, but the earlier don't - so extra levels aren't very important.

Therefore, I maintain that Spirits of Rage is not very useful. You can always use the "spirit 30" code to map out a good level-up route to get the most desired skills at the lowest possible level. That alone should be more effective than this skill, which mostly gives you 2 extra levels.