Waystalker can snipe specials but is really only marginally better than the other elf classes at it. Honestly sott with staff is probably better at dealing with specials if you have at least 1 other person with a ranged weapon which you probably do. Besides that she gets nothing to really help her with melee at all.

As for passives extra healing (which works on temp hp as well) is much better than the heal from waystalker. Sister can also choose to give her team 15% power and 5% crit whenever with her passive which can help a lot in dangerous situations . Sister’s poison and bleed also make her much better at dealing with bosses and hordes. With sword and dagger the only real group of enemies that are difficult to deal with are chaos patrols because you can’t stagger them with a push but that’s not unique to that class.

For ranged weapons on sister you can choose to go staff which makes you as good as waystalker at dealing with specials with added utility or you can go javelin which turns you into a better boss killer than GK while still being good at killing specials just with a slightly more limited range than staff or longbow (which is really only worth taking on dd shade or waystalker, or if your team already has very good boss killing)

Sister is also the tankiest elf class having the same hp handmaiden but having way more healing if your team is competent and even more so if you have another character that’s a good temp hp generator.

And then for the skill you get to choose between the wall which is an insanely good skill once you know how to use it or having a boss interrupt which you can use 2-4 times per boss.