Here is my opinion as a tank swordsman lvl 120.
I did SW1/PLT3.
My stats are 1STR/1CON/1DEX
I played most of the time solo so that’s why my stats are kinda dps oriented. At the release i’m planning on playing in a regular group so i think i’ll play it different.
I started by doing a 1STR/1CON build, but my dps was not so good since i had no crits. Plus no dodge. Since i restat, it is now much more easier.
As a peltasta, there is some skills you NEED to get first as they are really overpowered when you get them.
First circle, i recommand taking Umbo blow over Rim blow. They have roughly the same damages, but umbo is multi target, and have an attribute for stun AND more knockdown. Then do a mix between guardian and swash buckling since you’ll need both of them for first dungeon.
Second circle, I recommend to NOT TAKE shield lob. Take high guard level 5, umbo lvl 10 and a mix between guardian and swash buckling,depending on what you prefer.
Third circle, that’s where the OP stuff is. You don’t have to overthink about it. UMBRO THRUST ALL THE WAY. It adds between 50% and 100% of dps on bosses depending on how much armor thye have. It will decrease with level since it looks like to be a fixed number of point than a percentage. But at the level you get it it is clearly overpowered. then at lvl 6 take high guard lvl 6 and get the umbo blow enhancement, it does a lot of damage when you get under high guard.
I might have forgot something so if you have any questions about peltasta you can ask me.