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Legend of Catachan: rescue danger and grenade evolution

The reported Catachan rescue is guarded by Warriors whose Synapse Emitters strengthen nearby enemies. Build up the run before challenging that encounter. His documented base weapon is Frag Grenade; its October reported companion is Bandolier.

Why the ring is dangerous. This is a support relationship, not a map of the rescue arena.
Warriors at the encounterCurrent hands-on reports Synapse Emitters.
Nearby enemies strengthenedThe surrounding crowd becomes a harder approach.
Prepare and choose an openingEditorial advice: build strength and retain space to retreat.

Reach the objective without relying on a fixed route

Follow the question-mark rescue method and expect a guarded fight. The IGN author reached Catachan after travelling northeast for nearly two minutes in one run. That is a reported route example, not a universal coordinate, timer, movement-speed check or required level.

The official faction reveal explains that removing a Synapse source can temporarily stun nearby lesser Tyranids. It supports prioritising strengthening enemies when you can reach them safely, but it does not promise that every Warrior in this particular encounter has the same universal kill sequence.

Reported grenade path. Frag Grenade with Bandolier leads to Ripper Pistol in the October community list.
Weapon Companion item Evolution Frag Grenade Bandolier Ripper Pistol Warhammer 40,000 mode Weapon Companion item Frag Grenade Bandolier Evolution Ripper Pistol Warhammer 40,000 mode

Ripper Pistol may be an addition, not a replacement

One current-demo player reports receiving a bonus poisoned Ripper Pistol while keeping the grenade. Treat that as a reported Catachan observation, rather than the rule for every evolution. If you still see the grenade after the upgrade, this report explains why that alone need not mean the evolution failed.

No grenade interval, poison value or exact Bandolier level is established. Learn the broader Synapse and enemy warning signals before turning this rescue into your next goal.

Sources