Here's my 2 cents...along with some data I acquired.
At level 11, with no embue and highest mastery level 1, I was killing Stone
Ghosts at the highest floor of the Ch'in tomb (away from any croud). I never
rested. I spent 5k on HP pots per hour. I farmed 20k in gold per hour (not
including drops). I farmed 90 SP per hour. After each hour, I needed
repairs, and to empty my inventory. These numbers are averages from a 8
hour session, and killing as fast as humanly possible.
At level 22, with my highest mastery at level 15 (only a 7 level difference
now), in a fast respawn area of Hyugno Ghosts (the aggro ones), I can still
farm 100 SP per hour...and this is with 45/55 points distribution (EP/SEP). Of
coarse Im killing a smaller number of mobs per hour so the gold income is
cut in half, but any item drops are worth 8x as much. Plus there are giants
now you can mooch off of (or solo for the drops). No giants in Ch'in tomb.
So in my personnal opinion, get the embue at level 5, there is no point in
waiting, its just a waste of your time.
