This is what I’d suggest:
https://tos.guru/itos/simulator?tinyurl=ydx2uarf
You can exchange Zwercchau for Sturtzhau, because of the def ignoring effect of the skill (make sure you pick lvl 1 Zwercchau though), however, I prefer Zwercchau because of the slightly bigger AoE.
Always take lv 1 Zwercchau and lv 1 Zornhau, as these two skills trigger ‘combos’ for Zucken/Redel.
Don’t neglect Highlander’s Skyliner, it’s strong af against single targets. It gets +70% dmg and +2 hits against bleeding targets, making it deal 416% x 4 skill factor against such targets. Moulinet is also pretty strong when used after Crown. Highlander is a boss obliterator class. Use Bash knockdown + Cartar Stroke combo to deal more damage against mobs.
Make sure you get 3x Prison Cutter cards and 3x Rajapearl cards, for obvious reasons.
This build is truly a monster against bosses, but it is very squishy due to lack of shield and DoV making you take +19% damage. Make sure you get high trans plate armors to make up for your low defenses. It’s also a good idea to focus on CON stat, as STR provides very little physical atk to even matter.
Barbarian is the true monster of the swordman tree. Frenzy and Warcry are insanely too strong. Make sure you always have these two skills up. As for Frenzy, the attribute is currently buggy and does not work, but as soon as it gets fixed you’ll want to max that attribute.