Fire giants, go into chaos tunnels next to Abyss entrance, there is a rift on floor.
When you get in, go to the portal on the west, plenty of fire giants, nice and empty too. Can be tricky whilst they are still aggressive, as they can hit hard, but getting into little corners is good. They have good drops, like the occasional rune scimmy.
They also drop a lot of fires, in sets of 150, and quite a lot of gold charms, and some grimy herbs. Just bring normal melee stuff.
They seem to drop key halves quite frequently, combining halves saves inventory space.
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