Take it easy.
Gretell says...
silent spectre (W)

A terrible spirit which brings an unearthly silence to the area around it, making it impossible to recite the magical incantations involved with casting spells or reading scrolls.

Speed: 10 | HD: 8 | HP: 39-52 | AC/EV: 5/15 | Damage: 15 | undead, doors, evil, see invisible, fly, unbreathing, insubstantial | Resistances: will(40), cold+++, poison+++, drown, miasma, neg+++, foul_flame, torm, napalm | Vulnerabilities: holy | XP: 312 | Size: Medium | Intelligence: human.
Henzell says...
  1. A weak ghost that spawns in Crypt. It radiates silence over a huge area (bigger than LOS). Will happily follow you around and trivialise all spellcasting enemies, if you're a fighter. Cannot use stairs.
  2. Also a playable race in BcadrenCrawl; frail caster undead, silence aura of size 4 (compared to monster's 10); can cast and invoke while silenced; but no scrolls. Allowed to Transmute (formless ghost, not rotting corpse).

Information based on master branch and the great LearnDB.
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