Help on spell ritual of the last circle

Current upkeeper: Morpher
Casting time    : 66
Spell cost      : 2000
Spell type      : generic
Affecting skills: Demon lore, Summoning mastery
Affecting spells: Greater ritual of chaos, Lesser ritual of chaos
This ritual allows a powerful warlock who is atleast an Initiate of the Last
Circle to try to summon a reaver demon to serve the warlock.

Rimefang < List > Ritual of the scorched skies