EzekielRaiden
Follower of the Way
I....really really really REALLY think that is a bad idea that opens all sorts of questions from the player e.g. "well why can't I choose to summon it the normal way anymore? Why do I have to do this this way now? Why can't I do both things by spending more resources or something?" etc.Well you can let them summon and delay the subclass until 3. That's how you would do it. The summon transforms into your merging idea.
This closes loopholes and makes sure you don't get silly, wonky stuff coming out. Yes, it defies the 5.5e conventions, but I started this before "One D&D" even had a name. I'm not really interested in changing it now. Not that this is even the appropriate thread to have a debate about it.