Kill mobs that are around level 35-39. I've had the runes drop off of kobolds in Sol B, undead frogs in Lower Guk and other things in that level range. The royals camp in particular would probably be ideal for you. The Rune of Concussion is also used in a level 49 spell and will drop off higher level mobs in the planes as well as lower level mobs. It might be a little easier to find than the others.
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