I have a group we've been playing for about half a year, so the characters in the group are well established.
They've spent all that time on one planet. At the end boss battle of this adventure, one of my players got hit by a energy weapon and landed on a body 10 critical hit. Which burnt him horribly, set off all his grenades, and melted his eyes.
Now my players want to change to rogue trader adventures, and focus on space exploration.
They've defeated a Greater Demon of nurgle , though in weakened form, recovered a space marine relic weapon, destroyed a nurgle cult, and lots of other minor victories. They have also collected a archaotech depository that can contain certain heretical or unknown patterns.
So at the moment, they have one favor available from a space marine chapter, they have done a great deed in taking down a greater demon, their Inquisitor has gotten a boost in his renown from his good acolytes. He is also a radical inquisitor.
They will get their hands on a ship either through the inquisitor or the space marines, most likely the Inquisitor. They will also need a navigator, so my thought was to maybe replace the character that lost both eyes with a bionic, xenos or heretek technology, what I am looking for is a as lore friendly a way of giving this player the ability to navigate the warp as I can.
I am quite willing to bend the rules, but I prefer not breaking completely with the lore, so I at least need a small justification for how this comes about. The archaeotech depository they have could of course contain a pattern or location of a set of bionic eyes, maybe pre heresy experiments, any thoughts about alternatives I could use?