a skull (A)

requires attunement by a a warlock
Special:
The spells "Summon Lesser -" and
"Summon Greater Demons" are always availibal
to you. In addition you learn the Spell "Planar
Binding", however you can only attempt to cast
it once per day and used this way fiends have disadvantage and fey/celestials have advantage
on the save.
Stage 2: ?