From my searching of the Forums most of my questions get answered. So I've decided to ask some questions that I already have l answers to so my Brother Techmarines can find all their trusty Servo & Mechadendrite needs in one spot. As I would find that handy if I was looking for all things Servo & Mechadendrite related.

1) Servo-Harness make up
From the rule book I know "At a minimum, a servo-harness consists of two servo-arms, a Combi-tool, a fyceline torch, and a plasma cutter."
a) Does this mean that to get other mechadendrites for the servo-harness one needs to pay more req or can it just get pimped out the wahzoo?
b) Is there a limit on the number of arms/tools?

2) Utility Mechadendrites
a) Medicae Utility - I can't seem to find details on this would also would it require the medicae skill to use it?
b) Machine Spirit Interface, Manipulator, Utility, Optical, where can I get more info regarding these variants?
c) In order to use the fyceline torch and plasma cutter of the servo-harness one will need the mechadendrite utility skill. correct?

3) Weapon Mechadendrites
a) Can one use the ranged variant as a reaction to attack? ie an enemy drops down in front of me my reaction is to kill it.
b) Range variants are Pistols only. correct?
c) Does a melee weapon variant add the weapon characteristic on top of the Servo-Arm base stats? which leads to my next question.
d) Mounting a Power Fist? A Servo-Arm has unnatural str x2, now being a weapon dedicated arm would it get unnatural str x3 from the Power Fist bonus? Meaning the Damage would be 2d10 + 21 (7x3) or 2d10 + 24* (8x3) for *exceptional version. Or from my previous question would that mean 4d10 + 21 (7x3) or 4d10 + 24 (8x3)*. From what I read a servo-arms strength value cannot be increased or decreased through devices or abilities that affect the Techmarine’s strength. However this is a weapon variant, not box standard servo-arm so would it gain the extra unnatural strength because it's no just a servo arm but a weapon Mechadendrite. Or would a powerfist be a complete waste of time. What weapon would be worth it?

Can't answer everything but here're my two cents

1)a) I'd just say it's a fluff sentence, if you want to add something to your harness, pay the price.

b) I think a Servo-Harness only has 2 arms?

2) No idea ^^

3)a) I'd say yes

3)b) Don't have the book right now to check.

3c) I'd say no. You don't add your unarmed attack when using a melee weapon, so the Servo-arm doesn't either.

3d) Don't know if you can really mount a Powerfist on your Servo-arm, but if you do I'd play it the way you describe it (i.e. 2d10+21/24).

4) I'd say yes, because it's the character who "wields" it.

5) A Techmarine can always do a two-weapon attack. If he doesn't have Two-Weapon Wielder (Melee), he has a -20 to hit on both attacks. If he has the Talent, then the malus is only -10.

Maluses should be -20/-40 (dominant hand / non-dominant hand) without the Talent and -10/-30 with it, but Space Marines are Ambidextrous, which evens the maluses

Stormast said:

HDaniel said:

This is in dispute because in Dark Heresy it says you can at the increased negative, as stated above. So it comes down to a GM call. But I will say that it really does not make any sense that my super intelligent, and dextrous elite ambidextrous warrior cant use both hands to attack. When I the uber nerdy, no training geek can make attacks with two weapons in real life. (with no training)

So as a GM I would allow it, and give the negatives.