Bram's Will-o'-Wisp Summoning

A Will-o'-Wisp appears in the same space of one medium or smaller creature that you can see within range. The creature must make a Wisdom saving throw or become charmed by the Will-o'-Wisp and incapacitated for the duration of the spell.  At the beginning of each of the creatures turns it will roll 1d8.

1: The Will-o'-Wisp will move 15 feet north (or until blocked by another creature or object). The charmed creature will then follow it and move to the same space and end its turn.

2: The Will-o'-Wisp will move 15 feet west (or until blocked by another creature or object). The charmed creature will then follow it and move to the same space and end its turn.

3: The Will-o'-Wisp will move 15 feet east (or until blocked by another creature or object). The charmed creature will then follow it and move to the same space and end its turn.

4: The Will-o'-Wisp will move 15 feet south (or until blocked by another creature or object). The charmed creature will then follow it and move to the same space and end its turn.

5-7: The Will-o'-Wisp and creature stay in place

8: The creature takes it's action normally for this turn.

At the end of each of its turns the creature can attempt another Wisdom saving throw to end the effects of the spell.  Once a creature saves against this spell it is immune to future castings of this spell for 24 hours.

For the purposes of this spell the Will-o'-Wisp does not have the stats of the monster sheet, but instead is an incorporeal being immune to all damage types.  The Will-o'-Wisp can be dispelled by spells like Dispel Magic or Banishment.  It can also be dismissed by actions such as Turn Undead.  

At higher levels: When you cast this spell using a spell slot of 2nd level or higher, you can target one additional medium or smaller creature for each slot level above 2nd. The creatures must be within 30 feet of each other when you target them.