VT aoe basically makes grinding alot easier. but only really effective if you have high skill crit chance (say 70% or about). It gives you enough time to survive most pulls until your next Terms of Service. Otherwise, potting is likely. AoE DNA is unlocked at 2nd class (defi / domi) potens VT DNA makes it faster to recast.
pets are fun at low levels, useless for defiler. illusion will give you a 1 hit guard and a second or 2 from mobs. they will always target illusion before you and then have a brief moment when they re-calibrate next target. not really worth it.
binding is useful in pvp and pve. i'd put no more than 5 into it. typically holds a strong target down until Terms of Service is ready.
shape of fear is also useful. HOWEVER if you attack a feared target, they lose fear status. so needs care when using. FUN skill in pvp when you can use it on really hard to kill player so that they fall off a cliff. favorite troll move <3
evasion buffs are good but require investment into evasion stats to make them really noticeable. otherwise, you may wish to just up invisibility and skip blessing of wind. Invis increase evasion by a %, and this makes it possible to hit 40k+ eva by end game, but would mean you just dodge aa melee attacks from players and mobs. normally means your Hp or damage suffer if you choose to follow eva. reports are that less than 30k evasion isnt that noticeable. i think if you had the luxury of testing it or have spare points, get invis.