[Jurri]

Don't forget the Dracolich is firstly immortal, so it will still inflict losses for free even if it only kills a couple of shamans before dying. Secondly it's S5 in Bog Mummy form, so once a dueling squad appears it just needs to teleport on top of them with a helmet and a pearl to duel 'em to death the following turn. That is to say, it boils down to tactics, with the immortal guy having the option of trying as many times as it takes and having the mobility advantage, to boot. So unless you have cheap national astral mages, no, I don't think magic duel is the answer.