You see a magic pillar
Notes
After Ferumbras death, there will be Demons in his room. These demonic beings are summoned by Magic Pillars.
Abilities
Summons (1-3 Demon)
.
Damage Taken From Elements
Physical
Death
Holy
Ice
Fire
Energy
Earth
Location
Behaviour
Magic Pillars are unable to move. They don't harm you, but their summons do.
Strategy
Just kill the Demons or run away from them.