. +CON : increased survivability in PvE, especially if you wear heavy armor.

+WIT : faster buffs. you still cannot buff a party faster Lineage 2 Adena than a warcryer.

BladeDancer
If you go +STR goes all the way with +5, same with dex if you go that way. tallum heavy and kesh*kesh go great with +DEX, magestic heavy and kesh*dama goes great with +STR.

. +STR : increases damage, never a bad thing.

. +DEX : helps you catch enemies in PvP, and helps attack speed.

. +CON : higher survivability, but will not make you a solid tank in PvE.

ShilienKnight
By increasing your attack speed, you increase your cubic fire rate. tallum heavy and a tallum blade with the haste SA is one way to do this. though a dark Lineage 2 Adena crystal shield will look better, a nightmare shield will work better.

. +DEX : increased fire rate for cubics.

. +INT : increased life from drains and increased land rate of lightning strike.

AbyssWalker
You are the strongest dagger, with a good Lineage 2 Adena crit rate. dark crystal light looks like it would be a good armor set, or nightmare light if going against magic wielding mobs/players. get a dagger with focus or critical damage.

. +STR : more damage.

. +DEX : increase in crit rate for more damage.

PhantomRanger
Tallum light for soloing, dark crystal light for everything else.

. +STR : more damage is good damage.

. +DEX : increase in crit rate for more damage.

SpellHowler
As a nuker, you want to level with +INT, you may add +WIT later for PvP. dark crystal robes for PvP, nightmare robes for PvE. get a sword of miracles in  Lineage 2 Adena A grade with acumen, and/or a sword of Valhalla in B grade with acumen. or you can max out your damage with a magic power SA.

. +CON : with the "body to mind" skill, more HP = more MP.

. +INT : more damage per spell.

. +MEN: more mp.

. +WIT : faster damage.

PhantomSummoner
By increasing your attack speed, you increase your cubic fire  Lineage 2 Adena rate. using a dagger helps to do this. you may want to get a set of blue wolf light or doom light or robes to +6.