For a Dark Heresy (40k RPG) scenario I intend to have an Inquisitorial outpost raided by a few Dark Eldar and I need some help and input in regard to how such a Dark Eldar warband would act “realistically” according to the background.
The Inquisitorial outpost is a hidden archive on a moon like asteroid in an Imperial system with a single habitable planet (i.e. a shrine world). The outpost is not well defended as its main security asset is that about no one (even within the sector’s Inquisition) knows about it. There are a few sentry guns (twin-linked autocannons and lascannons) on the roof of the main building as well as a few battle-servitors and maybe Inquistorial Stormtroopers as guards. A very old Inquistor-Emeritus is in charge of the outpost/archive and the PCs (Inquistorial Acolytes) are sent by their patron Inquistor with a letter of recommendation to consult the Inquisitor-Emeritus in regard to some occult texts.
Unfortunately for them, a certain Dark Eldar warband led by a Haemunculus got their a few hours in advance (they were hired as mercenaries by a certain cult to get the very same information (without any letter of recommendation of course…)).
Now the question arises, how the Dark Eldar would do this. The warband consists of their Haemunculus leader as well as ten Wyches and is allied with two Mandrakes. My idea was that the Mandrakes somehow infiltrate the compound and let the Wyches in so that they can slaughter everyone within and torture the Inquisitor-Emeritus of any information.
The PCs will reach the outpost a few our later and already wonder on the shuttles descent why they get no vox-reply from the compound. On the ground they find the first two decapitated battle-servitors and within the compound they find further decapitated guards and adepts (i.e. an overall massacre).
Now my questions: First of all, is it viable for the mentioned Dark Eldar warband to infiltrate and raid such a lightly secured outpost in such a way or in any other way? Secondly, how would the Dark Eldar react to the new arrivals (i.e. the 5 PCs)?
The PCs are rather martially minded and do not look like civilians. How arrogant are Dark Eldar and Wyches in particular? Would they ambush them with all force or would they see it as a hunt or game? Are they so overconfident to send only a single Wych at first in the assumption that 5 Mon’keigh are not a threat or challenge for more than one (or maybe two, three?) of them? Would they try to talk to the PCs or maybe try teasing, provoking or leading them into a trap?
I want to illustrate them as alien and as vile as possible without playing them dumb or absurdly arrogant due to false overconfidence (i.e. sending Wych after Wych to be killed one after the other by the PCs).
I really appreciate any helpful comments and ideas for this scenario.