You don’t have to sacrifice anything for Barb C3. Frenzy and Warcry are some of the best buffs for a Swordsman in the game.
Warcry at level 10, with all Attributes hits 10 targets, lowers all their defence by -30 and increases your attack by 60 per target, meaning 10 targets is 600 attack and the buff lasts for 40 seconds with attributes learned. 80 second cooldown.
Frenzy at level 10 stacks up to 20 times and gives 20 attack and that totals up as 400 attack. Easily doable on bosses and only splits the stack with attributes if you target another mob.
Together these buffs give you 1000 attack. It’s situational, but easily doable by a good player.
Highlander passive 50% critical damage with 2H
Simply go High > Barb C3 > Doppel C2.
You gain the passive ability this way as it’s available for High C1. 50% more damage to criticals is great, but not game breaking if you choose to go Peltasta instead for Swasbuckling for mobbing / pulling. The evasion from Guardian is nice too and I’m not sure which is better at this point.
For pure DPS I’d go for the build above though. Cartar will be at 5 and you gain the ability to use the 2H to block. Rest of the skills are terrible.
The block with 2H isn’t great, but with high STR you will be blocking for a lot and it won’t require you to swap weapons (block chance is the same as with shield when held up, just no passive blocking and shields gain more block as a swordie).
It’s not as good as shield block since you can’t change directions, but it works wonders with Doppel since they are the only exclusive class at ranks 6 and 7 to use 2Handed Swords.
DPE is fantastic at 1 or 2 points. I’ve heard it’s even slightly bugged in parties that if you activate it and just stand back ALL kills during the duration gain 2x EXP and Drop. Might be a bug and might be patched, but even without you can still use it well as Barbarian and Doppel excel at overkilling or killings things in 1 or 2 hits.
I’d max Cyclone since it’s one of the best AoE skills any sword can get, even if only 5 points EVEN with the nerf, but at 10 it’s a no brainer.
I would argue that this build is the best 2H Sword build in the game:
I would go into detail about everything, but your main skills for leveling are Cartar for early game, Seism for all ranks in Barbarian and Cyclone for the later game until you get to C2. Deeds of Valor at 9 is overkill, I know, but it also means the buff can be up 100% and you never lose the stacks if you keep buffing it I hear.
I only reached Doppel C1 in iCBT2 and I was the only one on the server. I didn’t get a lot of chances to try DOV out.