Building a Medium Swarm (and Makin' it Orky) (5e Stats)
I took six orcs and bolted them together.
Sanguine Grail Orcs (5e Stats)
To sum up, an orc tribe that was on the rocks prayed to Gruumsh. In return they received the Sanguine Grail: an artifact that allows the orcs to, painfully, extract powers and knowledge from their victims.
Building Monsters 1: Elite Orcs and Flamethrower Goblins
Making a few monsters with the D&D 5e rules