[Minecontrol]

In order of importance generally from most important to least... (i could be off a little with the order - eg some ordinary heroes give more than the huge bosses)

Use for the Bosses (except Baal of course), Driller, Gremlion, K'Tahu.

Use on Reha for the named heroes there.

Shinobi (Queen Guardian on Elon), maybe King guardian too.

Sheterra - the flayer hero (gave me a huge amount), the archdemon, the Death night npc, Scrounger

Nameless (only if you have used them on the above) then the Castle necro hero, and some of the other heroes here.

Demenion, the Champion on Verona..

The last two Tower of Eventus rooms...

If any left over (use on heroes in Reha, Elon, Nameless, Sheterra - first - then heroes on Verona, the orc island, Tekron, the island in the North ) Use on heroes before normal stacks.