In a campaign I'm running, I'm wanting to send a Revenant (or a few) after the party. It's of an Orc War Chief that they killed after they entered an Orc camp and killed everyone.

My question is: in 5th Edition, is there a template for Revenants that I can apply to a base Orc War Chief stat block, or do I just use the default Revenant stat block in the Monster Manual and say it looks like the War Chief? Originally I was going to just apply the Zombie template to the Orc, but I think a Revenant works much better for my purposes.