Bond souls

You chose one creature that his soul is now bound to yours 

Role a d6 and all the bonded creatures now have one extra spell slot of that level , the extra slots stay until the caster does a long rest(stackable)

Once one of the soul bound creatures dies the others are instantly healed to there max HP and the spell is dispelled 

When you use a higher level spell slot you are than able to bind one more creature for every level above the 3 level