Just an idea I wanted to try out.

I'm still very new to the 40k universe and the only 40k books that I've read that has assassin in it is from the beast arise series in year M32. I only about the assassin Drakan Vangorich and Esad Wire, none of which is a Culexus assassin.

So most of my information is going to be based from lexicanum so don't expect his to be perfect.

Now the equipment our Culexus assassin:

A damaged Animus Speculum (don't want something like this to happen 'Roman Torchwick appears -Eye-beam- Roman Torchwick is dead. Adam appears -Beam- Dead. Cinder -Beam-... THE END?) it can still restraint his aura (not that soul power aura. Well... Anti-aura? Reverse aura? Null aura? You get the point)

Synskin bodyglove with etherium built in, it shifts the wearer out of phase with reality, making him ghost-like and insubstantial. With the Etherium actovated it makes the wearers ghostly retinal after-images, flickering in and out of existence making it an already half visible thing even less visible and if the need arises it can turn completely invisible.

A Chainsword from a dead inquisitor. (yeah, I've read about Culexus assassins doesn't use weapons but he is a special case, in fact from what I've gathered the 40k universe is full of special cases like a half-eldar space marine or highly advance orks or 100 assassins defeating 400 space marines)

A Laspistol from the same inquisitor. (so now he be laspistol on one hand chainsword on the other and why a laspistol and not a bolt pistol or a plasma pistol? Simple is fires Lasers! And it has unlimited ammo. All you have to do to recharge it, is put the magazine/powerpack in a fire. As for why an inquisitor is using a laspistol? Well his bolt pistol ran out of ammo so he can't just give an empty gun to a soldier and tell him to avenged him.)

A Rosarius he picked up from the same dead inqisitor, a pendant with a mini shield genorator like the one Goge Vandire used to scam the sisters of battle.

-(story start)-

After getting hit by an unknown blast from an unknown weapon used by a rogue heretek that is experimenting on the mass production of psykers, so that is why Gray Lunarius was dispatched.

The imperium simply can't have a factory that constantly pump out an army of malcador class psykers, of course the chance the heretek succeding in doing that is extreamly low but the imperium simply can't take that chance.

So in the end it was all a lie and a trap, it was only meant to hunt to hunt down a certain inqisitor which they succeded. Before dying the inquisitor handed Gray his Chainsword saying "may this sword cut down your enemies" next his pistol "may this pistol find it's mark" then his pendant "may this relic shield you" andhis finished off with his last breath "and may the emperor protect mankind! Ave imperator!"

With that the inquisitor passes on, Gray then took the stuff and moved on. Unfortunately he fell by the final boss, robotics that has no concept of fear and Culexus Assassin who thrives on fear is a bad match up so he naturally fails.

Gray expected to have died in the blast but suddenly he found himself in a completely different place.

-(story end)-

Before the next chapter I just wanted to ask how should the Grimm react to him? Should they be hostile to him? Fear him? Or ignore him? I want some input here.