Theres a new 1hslashing sword that has this proc thats not listed on this site. Its called:
Etched Zraxthril Warblade
MAGIC ITEM LORE ITEM
Slot: PRIMARY SECONDARY
Skill: 1H Slashing Atk Delay: 26
DMG: 13
DEX: +4 STA: +4 HP: +20 SV COLD: +5
Recommended level of 44.
Effect: Flame Shock (Combat)
WT: 1.2 Size: MEDIUM
Class: WAR PAL RNG SHD BRD ROG
Race: ALL
It drops in Toragin mines off a named. Don't remember the name of the mob though. Its a mob thats also suppose to drop a nice wisdom bracer.
Takata K'Trazz
LVL 62 Darkelf Warlord