The reason Lance reacted so strongly is because there is a uniquely shaped altar placed right in the center of the room.
It's a strip formed by black metal twisted into tentacle shapes, with a human-head-sized, dark red energy entity embedded in the middle, containing a strange power, and even inside it you can glimpse space cracks.
This thing evoked some unpleasant memories for Lance; he knows what it is, known in the game as the Cripple Walker's Altar.
Indeed, the Limping Walker is what was summoned back when the evil cult's Saintess sacrificed herself to the void during their encounter in the Beast Lair.
Similarly, inside the game one could follow the instructions—fire sacrifice is the beginning of destruction; desire the power of the void, then offer fire!
Simply put, using fire to ignite the altar can summon the Limping Walker.
This means the altar is a beacon for the Limping Walker; why is such a dangerous thing placed here?
