The Q'orl drone. (as per Xenology it is an size:average spidery xeno creature higher levels of Q'orl are known to be larger and have wings i.e. Q'orl soldier drones)

WS30 BS35 S35 T35 Ag37 Int40 Per40 WP40 Fel15

Movement: 3/6/9/18

Skills: Awareness +10(per), Silent move(Ag), Tracking(Int), Intimidate(S), Scrutiny(Per), Search(Per).

Advanced Skills: Literacy(Int), Tech-Use(Int), Secret Tounge: Q'orl launguage(int).

Talents: Swift attack, Ambidextrous, Hatred (Eldar), Heightened senses(Sight, Smell, Taste).

Traits: Crawler, Natural weapons (1d10+SB I), Natural Armour (1 all), Bestial.

Classification: Predatory, Warlike.

Weapons: (natural as described above), Q'orl drone weapon: 

The Q'orl drone weapon is Both a melee weapon with a paralytic venom and a weapon that can shoot out toxic smoke that is meant both to scare of the enemy and temporaly blind it. On specimens found it seems that all drones have had their original stinger removed and equipped with this weapon instead. This is the profiles representing that:                                                                                                                                                                                                            Range: 30m RoF: S/-/- 1d10 R Pen:0 Clip: None Rld: None Special: Blast(1) + smoke.

Q'orl Paralytic stinger: Melee Range: -- 1d10+SB Pen: 2  Special: Q'orl sting*, Accurate.

*Q'orl sting: Must be wounded: Instant; The effect is imediate/-10;  Toughness test is required at -10 to resist the posion/Paralytic; The victim suffers 1d10 temporary Strenght damage plus a further 1d10 per degree of failure. If reduced to "0" Strength, they are completely paralysed(but conscious) and unable to act. The paralysis wears of in 3d5 minus victims TB in hours.

What sort of encounter info would you have for this Q'orl? Is it something you would run into randomly, or in a Space Hulk, or what?

No not really, but the Q'orl have a rather smal empire next to the eye of terror, so far they have been without warp capabilities. But It seems that they are able to put in mind controling worms of somesort into Navigators. ("the disapearance of so many navis personnel has despicable implications" quoted from xenology)

I would think this is something you would probably encounter in the beast house or other such situations. Laboratories of the ad. mechanicus, =][=, etc.

:)

Here's one of my monsters:

The Arachnae

The Arachnae are among the most vile and sinister races mankind has encountered. Luckily there have been few encounters with them, and most people believe them to be mythical.
The Arachnae are spider like humanoids that feast upon living victims, sucking them dry of all fluids. They generally seem to prefer intelligent life, which they seem to have the disturbing ability to drain the victim’s knowledge and memories.
The Arachnae are obsessed with technology and constantly strive to improve and enhance their physical forms with bionic-like technology and genetical enhancement. Their level of technology is highly advanced with superior knowledge of genetics and machinery.
The Arachnae view mankind as the perfect slave race that can be easily modified to suit their purposes. They communicate through psychic telepathy and their minds are emotionless and analytical, and almost with a machine-like logic and systematic way of thinking.

Arachnae Infiltrator

WS BS ST T AG INT Per WP FEL Wounds
40 25 40 40 35 30 40 40 15 10

Movement: 2/4/5/6
Wounds: 8
Skills: Silent Move, Awareness, Concealment, Knowledge (Arachnae Tech), Intimidate, Climb +20,
Talents: Resistance (Poison)
Traits: Dark Sight, Ambidexterity, swift attack, Unnatural Agility, Resistance (Poison), fear 1
Armour: Arachnae Silk Robes (Head 3, Body 3, Legs 3, Arms 3)
Weapons: Claws (1d10+ 4 R + Arachnae Venom) Venom Injector (1D10-5 Toxic + Arachnae Venom)
Threat Rating: Xenos Majoris

Arachnae Venom (Instant/-10/Sedative)

This highly efficient venom is used to quickly stun and incapacitate their foes.

yeah i know its a bit of rip off several ideas but what the hell.