Center Of The Universe

Astral Sphere which is wide for 300ft is summoned at the beginning of every battle. Enemies takes 2d12  every turn and gets disadvantage on every Saving throw. On users trun it makes a beam,target must do a constitution saving throw (Dc=Spell save dc of user), if it fails gets 4d10 if it would be successful target gains only 5d4. If user want to use a Sphere as a spell it summons a little galactical explosion which is dealing 6d10 and if rolled damage is higher than 25 target gets stunned for d4 rounds. ,target must do a constitution saving throw (Dc=Spell save dc of user), if it would be successful nothing happens.

It is a spell so Spell Attack Bonus Count to every damage here