There is no other significant difference between the Hellstone Brick and Obsidian Brick variants. Due to the fact that Hellstone Bricks cause the Burning debuff, Ruined Houses made of Hellstone Bricks are much harder to navigate without taking damage until an Obsidian Skull is obtained.These items can still be destroyed by throwing them into lava in item form. The furniture found in Ruined Houses, with the exception of Demon Torches, is not dislodged by contact with lava, unlike most other furniture.