I would like to have a Rogue Trader who is a hero, even if not for the most moral of reasons. Perhaps he enjoys the thrill of living dangerously, or the fame and fortune that comes from his "heroic" deeds. Either way, whether a true hero or a self-promoting egotistical moron, this Rogue Trader is planning a daring rescue.
There is a person, or persons, of importance on a planet currently under attack by Tyranids. Bioships are preventing transports from leaving and, without aid from an Imperial Navy who are busy with "more important engagements", they're as doomed as the world around them. To top it off, the transports are filled to bursting with the "ordinary" citizens of the planet. "Rebels" have taken the planetary nobility hostage in their own palace to allow friends and family to escape certain doom.
So the Rogue Trader arrives to blast an opening through the Hive Ships so that the Transports can make an attempt at escape. But his main goal is the rescue of the nobility who, with their wealth and influence, can richly reward him. Rumour has it the governor's daughter is quite the catch too.
Now you know the WHY it is time to find out HOW. I've looked through the house rules but saw nothing about Tyranids. I'm wondering if anyone has any ideas about representing the Bioships in games of Rogue Trader.
Or if someone has already house ruled Tyranids please provide a link.