Q:
How Is This... Epic *SPOILERS*
I felt that the only thing missing from that five minutes, was the level of difficulty of the previous twenty.
It didn’t feel like the desperate last throes of a powerful creature capable of corrupting everything he touches to serve his purpose. Maybe if they added a few spawns during the final bit rather than just having five of you hammer the keys, then it would be a more interesting ending.
That or using zhaitans snakes to attack you and you kill them first… would just be better to actually interact a bit more.