Firbolgs have some innate spellcasting from their Firbolg Magic ability. They are able to cast Detect Magic along with a modified form of Disguise Self that allows them to look 3ft shorter to blend in with humanoid creatures like elves. They might be summoned because of the Lord of Blades, https://dnd-human92579.thenerdsblog.com/33614378/dnd-half-orc-art-things-to-know-before-you-buy