Ectoplasm Crystal is a Level 25 crafting material that drops from the Hollow enemies packed inside the Kindlewastes Hollow Halls. Ectoplasm Crystal drops exclusively in the Kindlewastes Hollow Halls, which requires a Kindlewastes Bone Key crafted at the Collector. The recipe unlocks after you rescue the Collector (Alden Crowley) and collect an Ectoplasm Shard; the Nomad Highlands Hollow Halls are a source of shards.
Quick answer: Craft the Kindlewastes Bone Key, open the Kindlewastes Hollow Halls northeast of Ancient Spire – Kindlewastes, and loot the skeletons and Hollow enemies inside for Ectoplasm Crystals.
What you need before farming Ectoplasm Crystal
The dungeon doors in the Kindlewastes Hollow Halls stay locked until you have the right key. Getting that key has one prerequisite of its own, so the order matters.
- Rescue the Collector and collect an Ectoplasm Shard to make the Kindlewastes Bone Key recipe available at the Collector.
- Craft the Kindlewastes Bone Key, a Level 23 tool that opens the doors inside the Kindlewastes Hollow Halls.
- Gear suited to Level 25 content, since the enemies in the dungeon are tuned for that level.
The Kindlewastes Bone Key costs 15 Ectoplasm Gem and 1 Giant Bones at the Collector, where each Ectoplasm Gem is made from 1 Bonemeal, 2 ectoplasm of any tier and 1 Water, so Ectoplasm Shards from the Nomad Highlands run work. Giant Bones drop from the Hollow Cyclops, which is also in the Nomad Highlands Hollow Halls, so clear that dungeon thoroughly before moving on.
Reach the Kindlewastes Hollow Halls
How much you can farm in one run
The dungeon is dense with enemies, so a full clear is worthwhile when you need a large supply. Searching corpses along the way also yields Salt and Bones. A complete sweep can produce 200 or more Ectoplasm Crystals and takes roughly an hour. The material stacks up to 500 per inventory slot, so a single run barely fills one stack.
You know the run worked when crystals appear in the loot window as you search each enemy and the count climbs in your inventory. If the door stays shut, make sure the Kindlewastes Bone Key is in your inventory; if you cannot find its recipe, rescue the Collector and collect an Ectoplasm Shard.
What Ectoplasm Crystal is used to craft
Ectoplasm Crystal feeds 14 recipes, from a refined material to a set of Iron Crypt furniture pieces. The furniture is built at the Collector, while the refined material uses the Ectoplasm Press.
| Product | Amount needed | Station |
|---|---|---|
 Excellent Ectoplasm (x10) | 10 | Ectoplasm Press |
 Iron Crypt Wall Torch | 5 (any ectoplasm) | Collector |
 Iron Crypt Brazier | 5 (any ectoplasm) | Collector |
 Iron Crypt Chandelier | 5 (any ectoplasm) | Collector |
 Large Iron Crypt Brazier | 10 (any ectoplasm) | Collector |
 Ectoplasm Gem | 2 (any ectoplasm) | Collector |
 Cyclops Showcase | 5 (any ectoplasm) | Collector |
 Giant Bone Arrow III (x50) | 10 | Collector |
 Bonestorm IV (x100) | 20 | Collector |
 Skull Summoning Vessel IV (x3) | 6 | Collector |
 Eternal Hollow Wretch I | 60 | Collector |
 Sword Of The Serpent | 5 | Lunar New Year Trader |
 Bow Of The Serpent | 5 | Lunar New Year Trader |
 Staff Of The Serpent | 4 | Lunar New Year Trader |
Resin, Charcoal and Iron Bars are the common partners across the furniture recipes, so keep those stocked alongside your crystals. Excellent Ectoplasm instead pairs the crystals with Torn Cloth, Fabric and Coal Powder. Since the Hollow Halls hand out so many crystals per clear, one trip usually covers every one of these builds with plenty to spare.
