Help: Glyph of Protection Usage sling 'glyph of protection' Available Heretic level 50: Glyph of Protection. Glyph of Protection attempts to seal the current room as a protected peaceful space for a timed duration. How It Works - The room must not already be peaceful. - The room must not contain NPCs. - The room must not contain fighting players. - On success, combat is stopped and mob memory is cleared. - The room gains peaceful/protection behavior. - If needed, the spell also adds NOMOB while the glyph lasts. See Also: heretic, sanctuary, fortify