Hello,
This is my first post and tutorial on this forum.
First I'll tell u the things u need:
deMSwZ which u can find here:
deMSwZ_v.2.0.2.rar
The .wz files u are going to edit.
And a back-up of the .wz file u edit.
MapleDump is helpfull too:
Cheat Engine :: View topic - [Relaese|Non-hack] Adventure Island
When u downloaded deMSwZ u open it, it should look like this:

If u want to open a .wz file u press the "..." (without the quotes)
Then u look for the .wz file u want to edit. First we'll start with mob.wz to make a godmode.
When it's done loading first u untick the box with "View Only".
Then u can start editing it. On top there is bodyAttack with the number 0 behind it. When its on 0 monsters aren't able to give u touch dmg, u get no dmg and no miss. If u want to use godmode for pq like LMPQ u should put it on 1 so u get dmg, but PADamage u put on 1 or 0 so u get almost no dmg.
PADamage is melee dmg, and MADamage is magic attack dmg,
If u put MADamage on 1 monsters are able to hit u but with 1 dmg.
Then we get to acc, acc is Accuracy (accuracy of the monster)
when u put it on 1 u will get almost no hits only misses, so if u put it on 10 its better so u get sometimes dmg but mostly misses, so people dont really think u got godmode. O_o
But when u don't do pq only training u could put everything on 0.
Then we get to firstAttack... i don't really know what it does... so sorry.
Then the speed part, its fun to set all monsters speed to far below 0,
so monsters move a pixel a sec, but it sucks when u do mob skills cuz monsters move too slow. But its easy though when u train at gobies, cuz i can even strafe them dead with my ranger. Well what u do with speed u can do ur own. Now comes undead, its very easy u just put it on 1 and all monsters are undead! Then invisible i haven't tried it, cuz i dont need it.
Now elemAttr, that is weak/strong/immune(or however it's spelled)for fire, ice, lightning etc. Now u can choose 3 numbers, i thought it was 1 strong against, 2 immune, 3 weak against.
Now the last part of this godmode, the empty box. U can put there w/e u want to edit like pushed (which is knockback) u just type pushed in the empty box and the second u type 0. U can edit lots of other things, but i noticed when u edit something that helps u with lvling(like editing exp, monster hp etc) or makes ur dmg higher(monster def(PDDamage and MDDamage) and monster avoid(eva)) it gets client sided. When ur done with this,
u press Process All. It should look like this:

When it's done with that u press Save to ... and select ur mob.wz
When u done this, Congrats u made ur own godmode!
WARNING: If ur using godmode, some places give a/b like in mushroom shrine the place where blue mm is and himes (too bad)
Now editing other things than mob.wz...
Like character.wz.
The most things u edit in character.wz get client sided like incDEX/LUK/STR/INT which is: included dex/luk/str/int,
or reqDEX/LUK etc. which is: required dex etc.
or reqJob and reqLevel, cuz if u could edit that, u can wear a Scarab as a lvl 11 rogue... in-game it looks like it worked, but u can't equip it.
But what does work is attackSpeed (but it dcs fast though(unless u jump alot like a thief)) to edit it u go to deMSwZ and untick everything.
In the empty box u put attackSpeed(everything u put in the empty box is CaSe SeNsItIvE) then in the second box u type 1, 2 or 4. 1 = really really fast(faster) 2 = faster 4 = fast, 1 dcs the most, then 2 then 4, 2 is the best to use cuz its fast and it doesn't dc that much when u put it all in u press the Process All button again, wait for a while then every weapon is faster/fast
then u press Save To, save to character.wz (dont forget to make a backup)
and ur done, go check maple to see if it worked. =O
Where u can find all such things as PADamage or attackSpeed is in Mapledump. U just load a .wz file, double click on something, then press data(on bottom) and open info there u can see all info of the item, monster or w/e.
Well this was my tutorial about hex editing with deMSwZ, rawr. now the credits part:
rCobra/CDGod for making deMSwZ
DoomsDay on Cheat Engine Forums for releasing Mapledump
Nexon for making .wz files
Me for making this tutorial
Photobucket for letting me upload pictures
And u guys for reading my tut.
Thank me if i helped u.