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.
Spellcasting. The silvertongue casts one of the following spells, requiring no material components and using Charisma as the spellcasting ability (spell save DC 16):
1/day: dimension door
2/day each: charm person, mage armor, sending
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.
Occult silvertongues are charismatic leaders. The alien mysteries to which they expose themselves can leave them feeling restless, paranoid, and suspicious. They begin to see things that aren't there and imagine conspiracies brought on by fears that others are trying to supplant them.