Never town. If you town, use escape to save all your party.
Don't rely on priest for heal. Stock up on pots, weapon enchants, armor enchants and if priest is unavailable 1500 HP scrolls. 1500 HP scrolls last for 30 minutes regardless of dying. Generally sw is available, but speed pots are good too so you don't have to wait around town. Other rogues will 60% of the time offer sw freely from town even if you're not in their party, but give them something back in exchange like fire resist, ac, light resist...you know your special buff skills that can be passed to non party members.
Rogues need to remember to give sw immediately to all their respawned party members.
Don't follow an invisible sin, let the sin follow you. Act as the target, even if you die, your sin party member will kill the other player and regain some np for you.
Don't worry so much about resistance accessories. Use accessories that will up your ap. There's not too many killer mages.
Mages should use one aoe skill. Hitting invisible sins will make them visible for a short time. So if there's more than one, they can now be targeted by all parties.
Town spikers are visible for a short time upon entering town gates. They don't normally come in straight ahead, so look to your left and right. If your a town sitter, hide in a monument or by innkeeper.
KSing is okay. The only good orc is a dead orc.
Stay with a large group of humans, even if they are not in your party. A bigger group of people will single out the strongest pkers and own his ass.
Dying is okay.