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I was wondering recently, while looking at the Aasimar race in Volo's Guide, which inherently gets resistance to necrotic and radiant damage, what happens when you get hit by an attack that reduces your maximum hit points on top of dealing (necrotic) damage.

So, for reference, I took a look at the vampire's bite attack (emphasis mine):

[...] The target's hit point maximum is reduced by an amount equal to the necrotic damage taken, and the vampire regains hit points equal to that amount. [...]

The descriptions of most other hit-point-maximum-reducing effects feature similar wording (wight, specter, ...). Some effects are different, such as the (demi-)lich's legendary action "energy drain", which involves no mention of necrotic damage.

The description of the Mummy is a bit misleading, however: (emphasis mine)

Rotting Fist. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 10 (2d6 + 3) bludgeoning damage plus 10 (3d6) necrotic damage. If the target is a creature, it must succeed on a DC 12 Constitution saving throw or be cursed with mummy rot. The cursed target can't regain hit points, and its hit point maximum decreases by 10 (3d6) for every 24 hours that elapse. If the curse reduces the target's hit point maximum to 0, the target dies, and its body turns to dust. The curse lasts until removed by the remove curse spell or other magic.

Now, while descriptions such as the vampire's bite attack are pretty clear and the max hp reduction would in fact be affected by necrotic resistance, I think the mummy's rotting fist is a different matter.

Of course, as per RAW, there is no connection between the initial necrotic damage and the hit point maximum reduction. However, since it's the same (dice) value, one could assume a connection between those two effects.

So, to be clear, I'm aware that, as per RAW, there is no connection. Should a DM, however, allow this "reduction of the reduction", due to the interpreted coupling between the effects?

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closed as primarily opinion-based by GreySage, Trish, Oblivious Sage, doppelgreener Jan 21 '18 at 16:30

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise. If this question can be reworded to fit the rules in the help center, please edit the question.

  • \$\begingroup\$ We can tell you what the rules say, but we can't tell you what you should do. \$\endgroup\$ – Oblivious Sage Jan 21 '18 at 15:43
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There does not seem to be a direct connection between the effects despite the same damage dice. The rotting fist damage is a consequence of the strike while the HP reduction is part of a curse that has a daily increase. The similar damage dice appears to be a coincidence.

You can treat the curse as a wholly separate concept. I could easily see a potential template (i.e. Mummified) for other creatures introducing mummy rot curse for the same damage dice but from different attacks. This would diversify the type of creatures you could use in a mummy-themed campaign or dungeon.

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