Naga

The Naga is a hostile boss mob in the Minecraft mods. The Naga drops Naga Scales which can be used to make Naga Scale Armor. The Naga spawns inside a Naga Courtyard from a Boss Spawner (can be found in NEI; produces a Naga when placed and when the player is nearby) and will not attack anything outside of it. If the player is outside of the courtyard, then the Naga cannot be damaged by the player.