Having played a number of games against Space Wolves, I despise Longfangs with such a passion that I decided to create a character with the express purpose of killing them.

I then realised I could combine this with my great love of all things
40K assassin, so here are my rules for Asaid Virenus. (She's an established character in the fluff, from the Thorian sourcebook:
http://secteur-calixis.fr/docs/Thorian_%20Faction_Sourcebook.pdf). At the moment she seems quite overpowered from some minor playtesting, so I'd appreciate some suggestions as to toning her down without detracting from her intended role (killing those

longfangs).
Thanks in advance.
Asaid Virenus
Points: 215
Ws Bs S T W I A
Ld Sv
8 8 4 4 2 7 4 10 4+
Unit type: Infantry (character).
Wargear: Frag Grenades, Synskin, Neural Shredder, C'tan Phase Sword.
Hyperpolymorphine: This experimental drug gives Asaid superhuman impersonation abilities. Unlike other Callidus assassins, she is able to make use of it even on the field of battle, causing havoc among the enemy. Asaid arrives from reserve using the Polymorphine rules. In addition, at the end of her Movement phase, after enemy Interceptor weapons have been fired, she may slip unnoticed into an enemy unit (providing she is not engaged in close combat). If she chooses to do so, remove her from the table and place her in ongoing reserves. She automatically renters play using the Polymorphine rules next turn. If Asaid chooses to enter ongoing reserves in the same turn she has already entered play using the Polymorphine rules, such excessive use of the drug will have consequences: Asaid must take a toughness test before being removed that turn. If the test is failed, she temporarily loses control of her body, and is not removed from the table.
Special Rules: Fearless, Fleet, Lightning Reflexes, Hit and Run, Stealth.
Incredible Flexibility: Asaid is able to contort her body in seemingly impossible ways. She ignores the effects of difficult and dangerous terrain while moving (including when charging).
Living Weapon: Asaid is able to grow and stretch her limbs at will, and even grow new ones! In close combat she may re-roll one failed roll To Hit, and one failed roll To Wound, per turn.