[1.1.2] Kwasozlop's unarmed Mara

As far as I know, it does not stack with a specific item - it stacks with all other stats creating a pool of modifiers.
The most notable thing is, no % is worth more than a flat x-y modifier (i.ex. 1-4 physical damage).

As for infernal blow, since the patch that brought multistrike+melee splash, the way to go is:
1) IB
2/3 multistrike / melee splash
4/5 added physical damage / added fire damage
6) faster attacks

Finally got my hands on both Bringer of Rain and Abyssus.
Guide update coming soon, I hope :P

Testing in progress:

Abyssus, rare 5L chest, gems:

HP 3528
STR 446
DEX 199
INT 69
dps 16516,4
phys. dmg 1541-2828 - same as fire dmg
attack speed increase: 214%
def: 6023
resistances: 77/77/67/-60
block/block spells: 38%/5%
life regen per second: 126,8

Non-legacy BoR:

HP 3720
STR 426
DEX 179
INT 49
dps 16400,4
phys.dmg 1107-2173
fire dmg 1934-3814
attack speed increase 202%
armour 4911
resistances 77/77/67/-60
block/block spells: 53%/6%
life regen 130,2

For now normal BoR > Abyssus untill I get a decent 6L chest. Abyssus seems better at dealing damage, but the survivability is way better with BoR.
Don't know bout leagcy BoR vs Abyssus thou.

Now testing out BoR with Blood Magic passive swapped to gem, auras: grace+hatred.

Since the update 1.2, the tree has been changed too much for this build to recreate.
There will be no more updates, since I am following KorgothBG's thread:
http://www.pathofexile.com/forum/view-thread/445390/page/1
Thank you all for your support and ideas.