[maltz]

I also heard that by end game Warriors will have an excess of might runes (especially if you have a few more levels than characters in impossible). I am just wondering whether the limited runes in early and mid game can be spent on things that makes a difference.

I just checked the exp levels for rage spirits. For example, (normal difficulty):

Lv20: 5800 EXP
Lv21: 6510 EXP
Lv22: 7280 EXP

Let's say one reaches the highest level of Master of Spirits as early as possible and get a good 25% boost from the base 5800. The spirit at level 20 therefore has 5800 x 1.25 = 7250 EXP. Exactly like my guess: 1 to 2 levels more.

Since I am still early in the game all of my analyses are hypothetical. After I complete the game maybe I will have a different opinion (not likely from the evidence above, anyways).

A similar skill "learning" concerns the EXP of the character. Although it also implies only 1 or 2 extra levels of the character, the extra 1500 Leadership from 2 extra levels seems pretty sweet. I know Mind Runes are rarer for Warriors, so maybe it is still out of option.

By the way, not being able to backtrack just makes the skill even less appealing. As a result I fully understand that if one wants to have maximized stats by the end of the game, one should take these +EXP skills ASAP. But on higher difficulties there might not be such an luxury anymore. One has to make inferior choices to buff themselves all the time to pass the challenges.