Hello all, I could use some feedback on a Legendary weapon I created for a Raid Boss-type enemy. The idea is that the party has to help wipe out a cult of "Blood Marauders" who worship Morvus, an Orog demigod blessed by Gruumsh with amazing power and vitality (basically Hercules).

The weapon is as follows:

"Nightfall

Martial, Two-handed

Dmg: 2d12 Str modifier

This gigantic maul, forged with necromancy from the souls of the dead, can drain the souls and maim the magic of those it hits.

On a hit against a spellcaster, roll a d6. On a 6, Nightfall removes 1 random spell slot. Roll a d10 to determine which level of slot is removed (choose which on 10). Slots can be recovered after a long rest.

On hits against a non-spellcaster, deal an extra 1d6 necrotic damage."

Let me know what you think!