Space Hulk: Tactics

Playing the Genestealers mission (Broodlord version), I got this on mission 6, Assault against the Dark Angels.

You get 2 choices for the mission at the selection screen, just make sure you choose the one that has “The Reaperflex biomorph must survive” as the secondary goal. Now win the mission without getting the biomorph killed. If you want to be absolutely safe, just hide him at the back of the map, so the terminators never get near him.

Good luck!!

In Skirmish, load up the Osulas map as Tyranid Genestealers, and whenever you get a card to upgrade a blip to a Reaperfex or Bulwark Biomorph, do it. Try to get behind Space Marine Terminators as much as possible, there's only five of them in the mission, and there are ways around their Overwatch, and sometimes they'll use up all their points and can't afford Overwatch in the end, so always be on the lookout for better-chance kills where you can get behind them or approach from the front if they didn't activate Overwatch.