One of my players managed to kill an broodlord in hand to hand at level one thanks to a mixture of smart tactics, luck, tactical spacing and his full compliment of fate pionts and deameanor. Taking a chest wound and loosing permenent toughness.

as a reward I gave him a master crafted chainsword called light bringer as his signature wargear and waved the renown requirements for this one item.

as he is advancing he would like to keep the sword but use the power crystols fromthe emorer protects to enchance the weapon so that he can keep it with him as he gains renown without replacing it for a power weapon. his current renown is now distinguished.

i was thinking of giving the sword the power field trait as a result of adding the cyrystols. this works out at about 40 renown 5 for chainsword +15 for trait using the inquistorial upgrade req cost as a guide line and doubling for master crafted. I dont want to ive him a power sword with tearing a thats to powerful so I am looking for sugestions.

my current idea is to double the chainswords pen and increase the damage by 1 as a result of the power field does this sound right? or is it to much?

another option that has been suggested to me is to use a power sword stats but give the tearing quality instead of any of the bonuses for signature weapons master such as +10 to hit.

Disclaimer: Away from my books and in a rush, at the moment, so take this with a grain of salt.

I think it might be a little powerful at this level, but take a look at the SW relic, the Frost Blade. Its the only example of a power chain weapon that I know of. So if you scale it down a little, it might be appropriate.

Another example of Power Chain weapon is Eviscerator, DH Twohanded Power Chainsword.

But if i may be honest i would rather give Chainsword Mastercrafted Quality level and Razorsharp trait.

Strangely though, the eviscerator doesn't have the power field trait (although the description does mention a disruption field).

Comparing DH and DW, however, melee weapons are almost the same. It seems that DW weapons just get a point or two of extra damage or penetration.

If that pattern holds true, then changing a DH sword to a power sword gives it +5 damage and +6 penetration. If you apply those to an astartes chainsword, you get 1d10+8R 10P Balanced, Tearing, Power Field.

Tone that done a little (as appropriate to your campaign), and I'd call it good. Just keep it better than a power sword, since the player earned it.

That's even better than the power sword, not counting Tearing (which is crazily good...).

No I think the OP got it figured right: much more Pen (as it's what Power Weapons are for, at least in TT), maybe a little bit more damage, but that's icing on the cake...

If you give it enough Pen, without even adding damage, his sword will be better than a Power Sword (Tearing on an 1D10 damage weapon equals more or less +2 if I remember what I calculated once well).

I'd recommend the following: