Thank you!

There's 12 total files that need to be edited. One file for each of the four areas, and one file for each difficulty of the dungeon. The files are are "mapname.conditional.1.mash.darkest", where mapname is the area (Weald, Cove, etc) and the number is the difficulty (1 = Apprentice, 3 = Veteran, 5 = Champion).

The easiest way to edit these would be to subscribe to this mod and then edit the files that you download from the workshop. You can find this mod in your workshop folder which will probably look similar to this:

C:\Program Files (x86)\Steam\steamapps\workshop\content\262060\2554675161

Once you find the files, you just open them with a text editor and change the .chance value. The first line is for the Shambler, and the second line is for the Collector.

Which file needs to be changed to increase Shambler's spawn rate? I need some trinkets from him, but he hiding from me(

It's fine, I already changed it anyway. It's actually a good idea to keep the initial spawn rate and then slightly change the other two. I like this way better.

Don't mind me, I'm somewhat new to this game, I remember beating collector once, but getting obliterated by shambler, it's a shame about not being able to run really. I didn't even know shambler had a spawn chance in torchless xD

To match the collector spawn. I can change it back to 1%.

Interesting, so basically running into shambler with baby team means insta wipe almost...
Why go from 1% to 3 on apprentice?