This guide breaks down every Cathulid variant and mutation you can get during the Cultist Lair update in Fisch. I’ll walk you through how to access the lair, the key quests that unlock the Leviathan Hunt, and exactly what rod, bait, event, or material each Cathulid mutation needs. Use the headings to jump to the part you want — read the whole guide if you’re aiming to spawn the Leviathan.
All Cathulid Mutation to Unlock Leviathan & How to Get them
Rainbow Cluster Cathulid
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How to get: Must use the Rainbow Cluster Rod (only available during a rainbow event).
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Notes: This rod/variant is event-limited; if there’s no rainbow event you cannot get it.
Aurora Cathulid (Aurora Cthuluith)
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How to get: Fish in the appropriate rooms using Aurora Rod or Aurora Bait.
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Chances: Aurora Rod alone ~15% (per guide), Aurora Rod plus an Aurora item raises chances to ~30%. Aurora Bait is another ~15% option.
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Where: spawns in Hall of Whispers / Passage of Oaths areas.
Purified Cathulid
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How to get: Requires the Insight Enchantment (apply to bait/rod or use insight mechanic when fishing).
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Where: Sanctum pedestal types; exact spawn area is cultist interiors.
Solar Blaze Cathulid
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How to get: Eclipse event spawns. Using Fang of the Eclipse during an eclipse greatly improves chance.
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Chances: Base is low (example: ~10%); using Fang during eclipse can give much higher chance (guide mentions up to 90% in the right conditions).
Nova Cathulid
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How to get: Linked to Starfall / Starlight Bay events or locations. Use rods or baits that boost starfall/stellar spawns.
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Where: Starlight/Starfall related areas mentioned for Nova.
Mastering every Cathulid mutation in Fisch’s Cultist Lair is the key to unlocking the full potential of the Leviathan event. Each variant—whether it’s the rare Rainbow Cluster, time-limited Solar Blaze, or event-based Nova—requires specific tools, timing, and strategy.
Understanding when and where to fish, along with using the right rods and enchantments, will make the difference between catching a common variant and obtaining the crucial ones for the Sanctum. Keep experimenting with rods, watch for special events, and follow the right conditions to complete your collection and awaken the Leviathan successfully.