Huge many-limbd spider, made entirely out of obsidian, full of veins of precious ores and crystal. The only vulnerable spots of the creature are the belly-"mouth" for a short amount of time while breathing ore/shards & the large runes on the back of the creature. The (3) runes can only targeted from range, when at least 3/10 legs are damaged and not regrown yet. Or if someone gets on the back of the ghost into melee-range of the runes. Instinct: to destroy intruders

• Protect the Main Gate
• Grow a huge blade from molten ore or crystal..
• Spew molten ore & crystal shards.
• Jump & crushing landing
• Control elements (cold, heat, water, earth)
• Grow spikes from the main body for defense.
• Regrow limbs