Suggestion: Steal Spirit-Report
How do we know what we got?
I just used Steal Spirit for the first time, and I didn't notice anything happening at all - except for the target champion dying.
I started looking through my traits, and didn't notice anything new - but I also don't remember 100% exactly which traits and level my caster already had.
The way it is now, they only way to know what we got is to remember which traits and levels our caster had, and then look through the traits again after using the spell, looking for some kind of change.
I think there should have been some kind of message\report, about what result a use of Steal Spirit has given.