Where to farm onyx:
a) Gratt treasure wearhouse (go to hazy talk to NPC but you gotta buy permit for 8 hrs)
b) Mirror dungeons (Go to various old dungeons and talk to an NPC to get into the lvl 115+ version)
locations: Crystal Quarry, Ahkma Cave, Lauke Monestary, Water temple garden
both of these places hurt a lot you gonna need a party.
Where to farm abyss:
New versions of burnt ruins/forgotten/giant fingerprint have OP as fu bosses and mobs. Kill the mobs to get parts to forge abyss. As well as this new temple of flox area which has more OP mobs.
What to do:
1) Find a static group to do all this pain in the ass content. (you decide which map you want to go to) or you could run 6 clients and hunterkit it up.
2) Farm various locations depending on what you are looking for. Mirror dungeons are also good for pet tickets and trans stones and whatnot.
3) Do intermediate/superior dungeon for that exp and rewards
4) Keep accumulating money and exp so you can do transcended stats forever
And yeah isen s0k