One stone is consumed for every Rune essence used. No additional experience is gained and it is not affected by Powerburst of sorcery.
Note that Soul rune crafting works differently: every charge on the Soul altar, 1 stone is used and 2 additional runes are gained. Note, however, that there currently is a bug where the stones do not work correctly with the Soul altar.
This Data was submitted by: ChathMurrpau
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