Magic resistance (GnollHack)

Not to be confused with GnollHack's monster magic resistance.

Compared to in vanilla NetHack, magic resistance in GnollHack provides a narrower scope of protection.

Effects

GnollHack's magic resistance protects against:

Polymorph magic from external sources
- Polymorph traps
- Vapors from a potion of polymorph
- Being zapped by someone else's wand of polymorph
- Having the "polymorph other" spell cast on you by someone else
Teleport and level teleport traps
Mana drain from anti-magic fields; they cause physical damage instead
The destroy armor, drain strength, and stun monster spells; monsters won't even try casting these on you, if you have magic resistance
The paralyze and confuse monster spells
Damage from the psi bolt and open wounds monster spells is halved

Three big parts of magic resistance's vanilla protection are removed in GnollHack, and are given to other resistances instead.

Item-cursing from external sources; now resisted with curse resistance
- The curse items monster spell; curse resistance neutralizes this completely
Damage from pure magic; now resisted with magic missile resistance (50%, 75%, or 100%)
- magic missile attacks
- zapped wands of striking or magic missile
Death magic from external sources; now resisted with death resistance
- Being zapped by someone else's wand of death
- The touch of death monster spell
- The instadeath effect of Death's touch attacks
- Being struck with a death-enchanted weapon

Temporary intrinsic magic resistance can be acquired through drinking a potion of magic resistance, or through casting the anti-magic shell spell.

The potion's magic resistance lasts 1d10+180 turns if quaffed, but only 1d5 turns if inhaled as vapors.
Anti-magic shell's magic resistance lasts 10d6+25 turns, but has a 120-turn cooldown from the moment of casting.

Extrinsic magic resistance comes from the following: