Well straight to the point it like when you evo you got your books back similar like that.
I suggest that hero level/skill/ talent can be resetted back.
Level - you got your book back
Skill - get skill point in form of master/purple slime
Talent- 8/8 talent can be turn back to 7/8 and you got back your talent stone.
Evolved hero can be devolved back.
You will get back probably 80% of your resources back.
I think you'll know what i am saying.
1) Get a permanent-marker and write name of the heroes you always wanted on your tummy.
2) Run around the house 5 times per heroes you write
3)Roll (If not succeed, proceed to step 4)
5) Repeat. (Y so serious?)