Assimilation Swarm: The 11th-Edition Tyranids Regeneration Detachment

In your Command phase, each Harvester unit (Haruspex, Norn Assimilator, Psychophage, Pyrovore, Rippers) can regenerate one friendly Tyranids unit within 6" — once per unit per phase. The regenerated unit either has a model regain up to D3+1 wounds, or returns a destroyed non-Character Infantry model at full wounds (Endless Multitude units return up to 3 models). Spread your Harvesters so their bubbles overlap your monsters and gaunt blocks, and the army becomes a Necron-style wall that just won't stay dead.

• Rapacious Hunger (Fight) — a unit regenerates after it destroys an enemy (a Harvester regains up to 3 wounds). Healing tied to killing.
• Reclaim Biomass (reactive) — when a unit dies, regenerate a unit near a Harvester, out-of-sequence.
• Ablative Carapace (defensive) — Feel No Pain 5+ on a Harvester (4+ on an objective) to hold contested ground.
• Tyrannoformed (Command) — a Harvester on an objective makes it sticky.
• Secure Biomass (Fight) — Lethal Hits, with easier crits for Harvesters.
• Broodguard Impulse — +1 to Wound against the unit that killed one of your Harvesters.

• Biophagic Flow — extends a nearby Harvester's regeneration range from 6" to 9", widening your healing net.
• Regenerating Monstrosity — the bearer's unit can be regenerated twice per phase instead of once.
• Parasitic Biomorphology — +1 Strength in melee, and a permanent +1 Attack if the bearer kills near a Harvester.
• Instinctive Defence — Fights First and cheap Heroic Intervention near Harvesters.

• Norn Assimilator — a Harvester monster and premier regeneration anchor that also hits hard.
• Haruspex — a Harvester monster with strong self-sustain that becomes nearly impossible to shift when topped up.
• Psychophage — a cheap Harvester and regeneration source with board control.
• Pyrovore / Rippers — cheap Harvesters to spread the healing bubbles.
• Termagants / Hormagaunts — Endless Multitude blocks that return up to 3 models per regeneration, making hordes attrition-proof.

Take it when you want a grindy, objective-holding army that refuses to die — a durable, sustainable list rather than an alpha strike. It's best with a core of Harvester monsters positioned so their 6" (9" via Biophagic Flow) bubbles cover your infantry and objective-holders. It's weaker if you need speed or heavy ranged damage. At 2 DP it leaves 1 DP for a support.

Sample gameplan: deploy Harvester monsters centrally so their auras cover your objective-holding gaunt blocks. Push onto objectives early, make a key marker sticky with Tyrannoformed, and hold. Each Command phase heal the most-threatened units, use Ablative Carapace for 4+ Feel No Pain on a contested objective, and Reclaim Biomass to undo casualties. Win on attrition and primary while the swarm keeps regrowing.