Drain Life - Does it have a MR check?

[Tuidjy]

No, there is no MR check. I just tried with a four mage firing squad against
a 24 hp unit with MR 30.

Without luck on the target:
10, 5, 9+ hps of damage from the first three casts.

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With luck on the target:
10, 11, 0, 0, 0, 3+
10, 0, 7, 0, 0, 0, 7+

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And there is something interesting I noticed. When the luck stopped the damage,
the mages received fatigue (of course) but instead of the expected 15, 16, and
16 (because of encumberance), they only got 8, 9, and 9. For some reason,
instead of costing 10, the drain life cost them only 3 fatigue. And these are
Death 3 mages with Skull staffs. Anyone got an explanation?