Melee Weapons
Prehensile Dataspike: This is a close combat weapon with the Haywire special rule. Additionally, this weapon may make a single additional attack at Initiative 10.
Power Fist: A power fist is a power weapon, and also doubles the user’s Strength (up to a maximum of 10). Power fists, however, are difficult and cumbersome to use, so attacks with a power fist are always delivered at Initiative 1 (ignore Initiative bonuses from special rules, wargear, etc.).

Wargear
Refractor Field: A Refractor Field confers a 5+ Invulnerable save.

Abilities
Feel No Pain: If a model with this ability suffers an unsaved wound, roll a dice. On a 1, 2 or 3, take the wound as normal (removing the model if it loses its final Wound). On a 4, 5 or 6, the injury is ignored and the model continues fighting. This ability cannot be used against wounds from weapons that inflict instant death (by having a high enough Strength or a special rule to that effect; even if the model is an eternal warrior). Neither can it be used against wounds from AP1 and AP2 weapons, power weapons and any other wound against which no armour save can ever be taken (like wounds from power fists, Dreadnought close combat weapons, rending weapons that roll a 6, Perils of the Warp, failed dangerous terrain tests, etc).

Feel No Pain:

If a model with this ability suffers an unsaved wound, roll a dice. On a 1, 2 or 3, take the wound as normal (removing the model if it loses its final Wound). On a 4, 5 or 6, the injury is ignored and the model continues fighting. This ability cannot be used against wounds from weapons that inflict instant death (by having a high enough Strength or a special rule to that effect; even if the model is an eternal warrior). Neither can it be used against wounds from AP1 and AP2 weapons, power weapons and any other wound against which no armour save can ever be taken (like wounds from power fists, Dreadnought close combat weapons, rending weapons that roll a 6, Perils of the Warp, failed dangerous terrain tests, etc).