Obsidian Platform

A Obsidian Platform is a stylized Platform that allows movement through the space they occupy by the player, certain enemies, and NPCs. The player normally stands on platforms, but can go down through a Obsidian Platform by pressing the down key while standing on one. Walking enemies will walk upon or pass through platforms depending upon whether the player is above or below the platform. Most flying enemies like bats will fly up through them, but not down. Other enemies, including harpies and worms, ignore them, entirely. NPCs will always climb up platforms. Obsidian Platforms allow the passage of liquids, and do not break upon contact with lava the way most platforms do. Weapons will travel through Obsidian Platforms; Any hook will grab them.

Because of the high mobility a player has while on them, platforms can be used in a variety of ways: as a walkway, a fast bridge to cross pits, or for roof access that keeps most enemies from getting through. Also, since Books, Candles, Clay Pots and other Furniture can be placed on them (except for torches and Crystal Shards), they can be used as a shelving for decorative purposes, or to pack more pieces of furniture into a smaller space.

Can be found in Ruined Houses in The Underworld. It was introduced to replace the Wood Platforms in The Underworld so that lava would not destroy the platforms.