Well first of all, most lvl 80 BPs are looking for a good solid debuff build, but sadly most fall short.
Well obviously u have to go with:
Now the other skill trees really its up to preference:
Is the usual good all round build, because if u come into situations where ur party needs an extra supporter, well u can shield up and drop back and support the party.
Those looking at the lvl 80 duff skill and saying why not, are restricted down to:
45 heal (1920 heal)
15 master (curse refection)
2 extra points
You might say oh thats not a bad build but ur missing a key component to survival, ur single full heal, 54 in heal, so u go:
1 extra point
So all and all u gotta sacrifice ur single most important survival tool for 70+ duffs.
SO along comes lvl 82 & 83!
@ lvl 82
Finally full duff comes into play!
Although @ lvl 83 an interesting build comes into play:
23 master ( Minaks Thorn)
I'm not totally sure how well that Minaks Thorn plays out, its sounds incredible and it has a cooldown the same time as its use, so it can be used right after the buff drops.
3 talisman (malice)
3 extra points, prob put in in duff for malice.
Although the Global Knight client Tables suggested the max lvl to be 84, not 83 so @ 84 a nice support build: