Elemental Blast and Zap are most efficacious against him. So are any weapons that are +1 or higher (+1 short swords, +1 long swords, etc.) Witch's Sticks will also work.
If you have Moon and Fiend magic, Pain and Spectral Raven work against him as well. Not sure about other spells, though.
Word of warning: Make sure you save before "whacking". Rumphy has a very small probability chance of "stoning" one of your characters on a successful hit, and if so, it can be rather $$$ to "unstone" them at the temple, unless you have "Stone to Flesh" which is one of the 6th level Stone Magic spells.
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