Bruh wtf is this deus ex machina, I was hoping they stop taking shifts after everyone heals up, maybe some kind of berserker potion so nick can actually move again (don't need to boost stats, just regain mobility) and all ram in at once. At least it would be less lame of a deus ex than that shiny ass armour.
Dragon flame slash through the torso, electric magic for the limbs and head, destroying the body(or just partially) . Then finally nick's Agility to crack that core that's only exposed by chance for like 3 seconds.
Fuck the sword of bonds, go sell that shit to some random merchant for a new pendant or better magic equipment.