Eldritch Communion

You conduct a ritual entreating an outer being to restore a missing spell slot no higher than 5th. At the conclusion of the ritual, make an arcana check with disadvantage, DC10+spell level of the missing spell slot. For a 1st or 2nd spell slot, the ritual requires 500gp on top of the base ritual incense price. For each spell level above 2nd, the cost doubles (1000 for 3rd, 2000 for 4th, 4000 for 5th).