ED, +min +max damage etc from armor works for ES.
strictly FCR
eth weapons do not break
S tier build imo, same cast BPs as paladin and necro so go for 125 FCR
This is how my ES lock is built:
insight eth CV
20 FCR helm (I use a diadem 2/20, Hellwarden is a nice temp)
mara (highlord is more damage but I prefer the +res)
trang gloves
ars dul mephisto
arach
10 FCR ring if mephisto book isn't 30 FCR, ring of choice if you don't need FCR (I like ML + LL on this ring, insight aura isn't enough mana if you spam ES hard)
1 ring of choice (I like BK here for LL + skill)
boots of choice
Merc might Emilio:
Fort + Andy + Pride
Bound demon: cursed lightning enchanted Urdar with Holy Freeze