I, a level 50 Paladin, have been testing this one on both mobs and people. On wooden/stone swords, it doesn't work and I wouldn't really expect it to. Haven't before, and soulfire on wood in particular would be ridiculous and also dumb. However, in the past it has activated with iron, but no longer does. It activates fairly often with diamond, and I have not tried with gold. (It's expensive ._.)
Testing has been done over the past three weeks, so plenty of chances for it to activate, since I don't like carrying diamond gear around.
Testing has been done over the past three weeks, so plenty of chances for it to activate, since I don't like carrying diamond gear around.