Writhing Tongues

Writhing Tongues can be cast to temporarily restrict one's speech ability, making them roll with disadvantage on persuasion or intimidation checks. 

The spell summons a mass of tendrils within the mouth of any opponent.

The tendrils altogether inflict 1d4 damage of the corresponding magic type, and may take the form of:

 - Tentacles for Fathomless/Great Old One Warlocks

 - Worms for Undead/Undying Warlocks

 - Smoky chains for Fiend/Hexblade Warlocks

 - Wings for Celestial/Dragon Warlocks

 - Brambles for Archfey Warlocks

 - Coloured fog for Elemental/Genie Warlocks