Guild Wars 2

1) Necro cannot do this.

2) You will have plenty of flexibility.

3) Staff is the only 1200 range weapon in the Necro’s arsenal. Scepter is 900, Axe is 600, Dagger is 130/600 MH, 900 OH.

Just as the topic says – when I drop down a Poison field and everyone else starts stacking poison as a result, is it my Condition Damage that is considered because it’s my field, or is it everyone else’s Condition Damage because it is their finisher?

Necro can do quite a bit and is extremely hardy. It sounds to me like you are stuck in the belief that the class needs to fill one of the 3 roles you listed.

Branch out, explore your options, realize that you can’t be pure DPS/Tank/Healer as any class in the game.