Scourge of Dragonkind (d20)
Best known for his defeat of the red wyrm Hynaxthis-following a battle that raged for three days and sealed the entrance to the dwarven city of Silvergard behind a hundred feet of stone-the cloud giant dragonslayer Cordric Skyterror is feared by both humanoids and dragons alike.
An NPC-ally or possible enemy-for your 5e game.