The Information of Level Treant 26 in the Last Chaos
Here is a level 26 pet leveler who trains on treants with Last Chaos money. he has no hit or attack armor on, that goes for accessories too, all xp are put into constitution, you are questioning that cause you want to put them into dex, In constitution your leveler will not hit as often, therefore making it easier for enemy to regenerate life, which is the point. And skill points are in uncanny movement and any other defensive passive skill there is.
You can put them in your live weapons skills too just to have somewhere to put them as you will not be using those skills anyway. Now go get a treant and see what your damage is, do not forget to take off your sword! It needs to be 20. Say its 23, the way to get it down is to get a friend or talk someone into allowing you to kill them 3 times, 4 for good measure.
After the first death your name will turn red and on your skills page, at the bottom you will see under good/evil in reputation box a -10. You should get -10 for each additional kill. For each 10 you get your damage goes down 1 point. Do that until you stand toe-toe with your treant and no one dies.
There are a couple of ways around your problem about the crafter/lvler thing. Your lvler should be separate f Aion the crafter for the reason you have described. Crafter needs to keep getting sp, and therefore xp. If you are in a guild you can have your GM turn off your xp taking completely.