Graveyard Map (Tier 5 Map) Bug - Boss is Already Dead, can't complete Map

The boss located at the stairs room of the Tier 5 Graveyard Map (Atlas Maps) is dead upon entering the room but it looks like there a lighting ball spell that keeps casting on repeat. This bug does not allow the player to complete the Map. The rest of the Map area seems to work fine.

There are 3 bosses in that room, it sounds as if you haven't killed the one that casts spark.

User error here, there is no bug. I did realize you have to select/active the alter in the middle of the room to begin the boss encounter.

S