Demonbolt

You fire a dark purple bolt at a target within range. Make a ranged spell attack roll. On a hit, a creature suffers 30 + 7d6 Necrotic or Fire damage (caster`s choice). Regardless if the bolt hits or misses, when it has travelled it`s maximum distance or hits an object; a dark portal is momentarily opened, summoning a demon or fiend! The summoned demon/fiend has a challange rating equal to half the caster`s level (rounded down). The DM decides what creature is summoned. When the demon/fiend is summoned, it takes it`s turn directly after the caster and the caster must concentrate to keep the demon/fiend under control. While under control, the demon is considered "friendly" to the caster and heeds his/her spoken command to the best of it`s ability. If the concentration is broken, the demon will stay for up to 1 minute, attacking anything within sight. After 1 minute or it is killed/banished, the demon/fiend errupts in flame. 

At Higher Levels: The damage increases by 1d6 for each slot level above 6th.