@JeremyECrawford Rules Question for Summon greater Demon. Can a Focus be used to substitute for the material cost (blood), since it has no cost and does not state consumed in the materials section? If so, can the caster still make the circle?
— Snowlio (@nix_zach) November 28, 2017
To create the circle in the summon lesser/greater demon spell, you need the blood mentioned in the spell's description. #DnD https://t.co/pNoD69gKb8
— Jeremy Crawford (@JeremyECrawford) November 28, 2017
One note though, you can still get the spell off it just doesn’t make the circle that protects you, so when you loose control it can and will murder you into next week
Good caveat