Nightblade is my favorite class due to he has ABB, Pneumatic Burst, Ring of Steel and Shadow Strike.
Dualwielding decreases cooldown of Pneumatic Burst.
On the other hand, ABB uses only 2nd weapon.
So, I have two questions:
If I want to set my LMB to ABB, which option is more viable?
In veteran difficulty, should I use any kind of 1h melee weapon (for example a weapon which gives % fire damage; but its attributes not contain cold damage) or only use 1h melee weapons which support cold damage (for example a weapon which gives % cold damage + % physical damage)?
Get Spectral Longswords with mods like physical > cold conversion, +% cold damage, life steal, attack speed. You can shop those at the secret vendor in Blood Grove (just reset the shop by going outside the area and open other vendors) if you dont want to farm undeads.
They also make Shadow strike very potent
Later on you can farm from Larria and Janaxia “Ugdenbog Chillstrife” and Ellena’s Necklace from Ellena the first Slith
DW Infiltrator is currently the strongest melee in the game. ABB is only strong as a nuke on a Venomblade Witch Hunter, and for cold it’s best used as Malawiglenn said.
It’s perfectly fine to go for 2h though, Leviathan or Soulrend or something. In any case, for best performance, you’ll want to use Beronath Fury (autoattack from Beronath Shard component) on your LMB and only press ABB once in a while to charge LA.