item mix formula changes

Item mix formula changes
i made changes to item mix formula due to bugs that item result are not accurate
this leads to some players can easily get any item by random mixing
now formula should work correctly
read guide section for updated formula


new donate and drop weapons and costumes will be final next week

also the skill problems will be fixed next week


residue and suryun mobs hp and damage reduced but dont lure 2 or more of them at the same time kill them 1 by 1