Late to the show but I caught something in there today.
Failing a save against a Sibriex can be interesting, gain Darkvision, +10 to Speed, wings with a 30ft fly speed, +1 to AC but -2 Cha, grow a tail that can be used as a whip, claws that deal 1d4, and so on. A bunch of them are flavorful, like double the size of your head, but very few are terrible (blind, -10ft spd, vulnerability). It might be worth caging one and ending minions in as a sort of breeding program.
Githyanki Silver Swords are an interesting consideration for defense. +3 Attuned Legendary(greatsword), but gives Advantage on mental saves, immunity to Charm, and resistance to Psychic damage. And I also love how Drow Matrons have a tentacle
rod that when used consecutively on someone drops their movement/reaction/dex.