Dropped by (***no spawn table):

• The Deep
• a thought horror spiriter (8%, 0.16 avg drops per kill)
• Chasm Overseer (15%)
• a young thought leech (10%, 0.2 avg drops per kill)
• a thought leech spiriter (8%, 0.16 avg drops per kill)
• a thought leech evoker (7%, 0.14 avg drops per kill)