Power crystals

[DFDATA]

I need ideas for more crystals or "counter-crystals"

These crystals can be found underground n they has mystical properties

Power crystal
- brings power to the owner

Life crystal
- bring life, found n forests

Dark crystal
- brings the death, weaken nearby units until finally kill them

Wisdom crystal
- brings high intellect, most of the smart races were blessed by its influence

Chaos crystal
- brings power n madness

Arcane crystal
- brings magic n mana power

 

[Pyrogasm]

What is the… purpose of these crystals? What are they used for?