

Help creating a lycantrope encounter (PaB:TSO)
Hi folks,
Fairly new DM here. I'm running 5.5, PaB:TSO for a table of four (lvl 7 cleric, warlock, warrior, and necromancer mage, which has 2 minions) and I'm planning ahead for an epic encounter.
Story time: our cleric of Selûne was attacked by a werewolf in her teenage years and has a silvery scar on her arm. This lycantrope is on the region and allied itself with Meliamne, a dragonborn warrior, initially for unknown reasons. Our warrior is a dragonborn calishite and Melianme is from her clan, so their stories are tied together. All in all, Meliamne and the lycantrope were helping the mind flayers, but in reality, they were after the obelisk shards for their own interest. They've been evading the characters and getting the shards for a while now, supposedly for the mind flayers.
My idea was to have an encounter against them at Gibbet's Crossing, on Qunbraxl's throne room, so the players would come in and find the mindflayer dead by Meliamne and the lycantrope, so I thought it'd make for a big encounter.
My plan was to have a CR 7 lycantrope (loosely inspired in this mutated werewolf stat) and the dragonborn (using the Githyanki Warrior stats + dragonborn's fire breath for the sake of making it easier). Fiddling here and there I created this monster stat. My idea was that, at some point, Melianmne and the lycantrope would fuse together for a phase 2 combat, stats still undecided.
In addition, my plan was to have a mentor of our cleric's appear when the combat looked ugly to heal everyone for a good 25 hp and, inspire our cleric and keep the combat going with her too (using the knight stats probably for convenience once again), so it's okay if the lycanthrope combat is initially hard.
All in all, I created this stat for the lycanthrope. I'd probably add them legendary actions, too. Feel free to let me know your thoughts.
Any comments are welcome and much appreciated!
PS. adding the MTG picture that made me go that route for the monster for reference.