gems etc in combat

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K said:

Nope. Air gems are one of the most elusive of the gem types, in my opinion.

To break it down:
Water: Sea trolls 1/turn
Fire: Fever Fetishes 1/turn if unt is Wounded(-10 HPs)
Earth: Blood Stones 1/turn
Astral: Clams 1/turn
Death: The Sickle whose Crop is Pain(gems based on kills with item)
Blood: There is a Demon Lord who spawns 3 blood slaves a turn.

The local peasantry (5K+ pop) is usually happy to oblige in providing any blood slaves you need, but you've got to park for a turn of course.

There's also an Arch Devil (Furcas?) that gives 1 fire gem per month, and one of the Earth Kings generates 1E.