Here are some addresses I found with cheat engine that you can modify the code in them to do different things. Under the dissassembler in memory view. If you do not know how to change code using Cheat Engine then learn first... :)
Regarding Mobs:
Clone Monsters?
004045C2 - 74 0f - je 004045d3
Change to a jg 004045D3 and you will see some epic shit happen with the monsters
Overflow and crash can happen so change it back in a few secconds or goto a place with a few monsters.
Freeze Monsters
00434ED8 - 74 2e - je 00434f08
00449C29 - 0f 84 96 03 00 00 - je 00449fc5
change to a jg and the monsters dont move
Turn Off Shadow on monster
00448B73 - 0f 84 67 01 00 00 - je 00448ce0
change to jg 00448CE0
Mob Model
004355A5 - 7f 14 - jg 004355bb
Change jg to je
0044891F - 0f 84 42 02 00 00 - je 00448b67
Change je to jg
Show all mobs even if they are out of area
0048BF2D - 0f 84 a4 01 00 00 - je 0048c0d7
Change je to jg
Can crash if too many mob.
Player Look:
Uber look hack
All Characters have effects.
0044703C - 0f 8c 1b 01 00 00 - jl 0044715d
change it to a nop
90 90 90 90 90 90
Regarding Mobs:
Clone Monsters?
004045C2 - 74 0f - je 004045d3
Change to a jg 004045D3 and you will see some epic shit happen with the monsters
Overflow and crash can happen so change it back in a few secconds or goto a place with a few monsters.
Freeze Monsters
00434ED8 - 74 2e - je 00434f08
00449C29 - 0f 84 96 03 00 00 - je 00449fc5
change to a jg and the monsters dont move
Turn Off Shadow on monster
00448B73 - 0f 84 67 01 00 00 - je 00448ce0
change to jg 00448CE0
Mob Model
004355A5 - 7f 14 - jg 004355bb
Change jg to je
0044891F - 0f 84 42 02 00 00 - je 00448b67
Change je to jg
Show all mobs even if they are out of area
0048BF2D - 0f 84 a4 01 00 00 - je 0048c0d7
Change je to jg
Can crash if too many mob.
Player Look:
Uber look hack
All Characters have effects.
0044703C - 0f 8c 1b 01 00 00 - jl 0044715d
change it to a nop
90 90 90 90 90 90