Guild Wars 2

Backstory
So a little back story, when the boss reaches 20% or 25% HP he goes invulnerable and you have to break his break bar, however all 4 party members died with the exception of the instance owner, a necro with very few CC. She then spent the next 40 mins to an HOUR using nothing but life steal to witle the boss down to 0 hp, before encountering the bug, by this stage all other team mates have left and it was just us 2.

Solution
The solution is this, the finish button isnt tied to the body, its still sitting towards the back of the platform where he originally spawned. just go over there and Boom, you should have completed it.

Hope this helps, shout out to the necro “Necrezia Donati”. God bless you.