How about Holy Weapon to buff the paladin BA spell which you can blow up as a BA later to do 4d8 AOE and possibly blind. Then there's aura of purity granting advantage vs all sorts of statuses. Aura of life resistance to necrotic and allies at 0 get 1 hp at the start of their turns. Shadow of Moil or Fire Shield could grant you some defense and passive damage if you get in close.