I just put my mage in Otiluke's Resilient Shield. The golems keep attacking the Shield, even though they can do no damage. This takes the golems (and the mage) out of the battle. The rest of the party beat up on Belhifet with melee weapons, following him around as he teleported. No potions, no magical enhancements. And no healing needed. And yes, everyone still finished with 30 HP or more.
My tank dwarf had the Boots of Speed, so he was always the first to engage Belhifet after he teleported and therefore the one Belhifet would target. And Belhifet couldn't hit him. The only real problems were the fire damage from when Belhifet teleported and some damage from the cloudkill when he teleported into it (and attacked the invulnerable mage).
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