Hex-blooded Wurmqueen

When you rage, You summon a spectral worm. This uses the Mizutsune statblock. You command it as a bonus action. 

You can also choose one spell of each level (up to 5th) from the sorcerer spell list. And can cast them each once per long rest. 

You add a +2 to your Strength, raising it above 20. Strength is your spellcasting modifier