The novel ARCHAON: EVERCHOSEN
You are a member of the 1st Company Terminator Space Marines, Crimson Consuls under Captain Bolinvar. During the events of the short story The Long Games at Carcharias, Bolinvar is tasked with clearing the space hulk the 'Revenant Rex' of various xenos infestations. During a cleanse and burn mission in a section overrun by genestealers you have become separated from the other Crimson Consuls and Captain Bolinvar. A corridor collapsed and you must make your way back to your battle brothers by a different route.
Starting at the arrow positioned on the grid at A2 on the MAP (below), move through the labyrinthine environs of the space hulk. Every time you encounter one of the blips on the MAP you must click on its grid designation below to discover the outcome of the encounter. You might be fortunate. It might just be a single monster. This section of the hulk is overrun with xenos abominations, however, and alone you will not escape a swarm of the monstrosities.
You prime your storm bolter. It takes a sustained blast from the weapon to put down a fully grown genestealer. You have enough ammunition remaining for 12 such blasts. Keep track of how many you use as you go along. If you encounter a single genestealer then it is assumed that a single blast from your storm bolter can handle the abomination. You destroy the creature and move on. This section of the hulk is overrun, however, and you cannot afford the time it would take to destroy the creatures one by one with your power glove. If you run out of ammunition and encounter even a single genestealer, it is assumed that you will be overwhelmed by other creatures in the time it takes to destroy it. You will have been torn to pieces and failed your mission. Return to the MAP if this happens, replenish your ammunition and try again.
You are searching for a way to reach Captain Bolinvar and the other Crimson Consuls. You can regroup at one of the section exits location on the edge of the MAP. Bolinvar and your battle brothers can only be found at one of them. Work methodically, use your instincts or choose at random - either way you must reach Bolinvar before you run out of ammunition. Avoid genestealers where you can. Remember - every time you run into a blip you must click on the appropriate grid designation to discover the outcome of the encounter. Follow the instructions you are issued there.