Bind Ghost

With this spell, you summon an undead ghost (see Basic Rules, the GM has the creature's statistics) that haunts the area around it. You target a humanoid creature that has died within the past hour, and then bring its spirit back as a ghost. The ghost will attack creatures that move within 60 feet of where its body lay when you cast this spell, the ghost cannot move outside of this area. You can designate a number of creatures equal to 1+your spellcasting modifier that the ghost will not attack. While you are in the area that the ghost inhabits, you are able to command it. Once given an order, the ghost will continue to follow it to the best of its ability. 

At Higher Levels. When you cast this using a spell slot of 7th level or higher, the radius of the area the ghost can inhabit and attack creatures in is increased by 30 feet per level above 6th.