i just edited my post :P read up on damage calculation
as an undead geomancer AND necro makes a lot of sense as it scales your poison damage and whatever necro may offer as heals is also able to heal you.
thus poison becomes a healing and damaging tool. You're raw numbers might suffer a bit as you have to spread some points into int and memory but on the other hand you gain a lot of utility and sustain.
for a scoundrel there probably is also a route to breaking magic armor first.
in that case mages wouldn't be your primary targets though but the fighters / marksmen. with poison dart and venom coat you will probably break through their magic defense and then use terror + ripped tendon instead of chicken + ripped tendon and finish off with sawtooth blade.
you can coat your weapon with fire as well. probably turning every stab into a fiery poison explosion but I haven't testet that.
for such a route you would want to invest more heavy into scoundrel. as the crit damage will scale into your physical fire and poison damage on the coatings. would be very interesting to see how that plays out.
good thing you have free respec once you own the lady vengeance at all times so you can't really make any grave mistakes
