EDIT: FromSoftware has temporarily disabled VAC. It is not known if it will be enabled again.
Although VAC is now disabled, there are still no tools for mesh modding/recoding.
To everyone asking if it is possible to do this and that;
the game has been VAC-enabled. This means that it uses Valve's Anti-Cheat system. Basically this system checks if you have modified "locked" game files, and if you have any programs hooking to the game, performing illegal operations. Some examples of things that are 100% surely not possible because of VAC:
changing weapon/monster/armor etc. balancing. new mechanics/changed mechanics, like adding a permanent lantern instead of having to carry a torch. These things are not possible because they would require you to modify the game files, and this is an always-online game. Some examples of things that will potentially get you VAC-banned:
texture/mesh replacements other visual mods like GeDoSaTo or ENB Series These are mods that intercept with the game's way of rendering, and from the automatic anti-cheat's point of view are the same as for example a wallhack. I'm not saying this WILL get you VAC-banned, VAC is a pretty smart system, and it super-extremely-rarely makes unfair bans.
The game is not officialy moddable, so technically all mods are "hacks". You should use anything at your own risk.
Note: I am in no way affiliated with Namco Bandai, Valve, or From Software; I simply wanted to have a post to point people to when they request mods that are not allowed by VAC.
Edited by OpenSaucer, 27 May 2014 - 11:16 AM.