Armor Class 13
Hit Points 127 (17d8 + 51)
Speed 40 ft.
Saving Throws WIS +6, CHA +8
Skills Arcana +8, Deception +11, History +5, Perception +6
Damage Resistances psychic
Senses truesight 60 ft., passive Perception 16
Languages Common plus three other languages, telepathy 60 ft.
Challenge 8
Alien Mind. If a creature tries to read the silvertongue's thoughts or deals psychic damage to the silvertongue, that creature must succeed on a DC 16 Intelligence saving throw or be stunned until the start of its next turn.
Magic Resistance. The silvertongue has advantage on saving throws against spells and other magical effects.
Crimson Bolt. Melee or Ranged Spell Attack: +8 to hit, reach 5 ft. or range 60 ft., one creature. Hit: 27 (4d10 + 5) psychic damage.
Elemental Servitor (1/Day). The silvertongue magically summons an earth elemental, which appears in an unoccupied space the silvertongue can see within 60 feet of itself. The earth elemental takes its turn immediately after the silvertongue on the same initiative count and obeys the silvertongue's commands. The earth elemental disappears after 1 minute or when it or the silvertongue dies.
CRCotN, p. 205