well the best way i know to lvl the skill is to enter a duel in a no pk zone like cronus, have your friend strong enough to get hit forever without dieing and make your sword be a weak tulwar. very slowly lvl hexchop over night, you seem to hexchop pets more than other players.
you can also lvl invis if youre a mage by going in tg, run to a corner, click and hold your mouse down, move the cursor over the buttons on the bottom of your screen and release your mouse button (this is called auotpilot) now make yourself run into the corner over and over while you have your hotkey held for invis(pen cap works great).
and i know its a passive skill but isnt the decision to use that skill client side? someone who knows ASM should really disASM and find an address we can mess with to force these passive skills. if someone knows where to DL a trustable disASM let me know and i might get off my ass and do it, but my ASM is super rusty and i dont think it was ever rust free to begin with.