[@Noodles]

It seems like you are a forcing a similarity between the Vassal and Spirit, not just in power but in description of the hydra as well. Just because the Vassal is a sword doesn't mean the Spirit has to look like it was transfigured from one, but that's really just a nitpick of mine if you are certain of it. 

As for the powers, again, they don't have to be the same. It's not expanding your skill set in the slightest if you have to choose between healing people yourself with a sword or doing it with a Hydra. I suppose you're welcome to try it but seems a waste to me.