i just wanna know what this is

If so, wouldn't a higher level character just bring a "mule/client" along to grab those etcs and level up? xD

Good idea for those characters that can take a skele hit/touch damage. Low level warriors/brawlers would benefit most, maybe thieves too, as they can avoid the damage. Hammer + Bone Fish is still the best way for a warrior to level easily though (super wdef up translates even misses into 1 damage).