Delios' Circle of Power

With this ritual a group of spellcasters can join their stenght to cast a more powerful version of a spell normally beyond their capabilties. When you cast this ritual from two to maximum four other spellcasters can join you in the process. They must remain within 10 feet of you and cannot do any other activity beyond chanting and performing somatic components. Then you choose a spell you know (maximum 6th level) and expend a Spell Slot of that spell level or higher. When the casting time ends, the other partecipants may spend a Spell Slot of that spell level or higher. Then you may cast the chosen spell at a Spell Slot level equal to its level plus one for each participant even if you do not have any Spell Slot of that combined level. If you do not cast the powered spell within the end of your next turn, the spell is lost.