Need to know about this one too, thanks.
Sundering Hand Axe
Slashing Damage: 6-28 (Req. 12 Axe Mastery)
Damage +16% (while Health is below 50%)
Armor Penetration +10% (Chance: 8%)
PC rare Axe AP+10(8% chance) +16%<50 max
Refyused
Malice Black
merchant pays good for this 
SincorpDeath
most definitely