The Maimed God's kiss

You gain +2 to spell attack rolls. In addition,
your spell save DC increases by 1.
Requires attunment by a spellcaster.
Whenever you cast a spell, roll a d6.
On a 6, no spellslot is expended for that spell.
On a 3-5, summon another minion
that does your bidding.
On a 2, you go mad temporarily.
On a 1, your dark minions turn agains you.