I've been wondering about customs DoTs (Damage over Time), like blight and bleed. I recently saw someone on Reddit, who made a custom character, tell a commenter that custom DoTs cannot be created with mods. That sounds quite strange to me. Is it really impossible to code a custom DoT? I've seen several "fake" custom dots, but is it really not possible make it?

I've been meaning to get into Darkest Dungeon modding, so can anyone provide any insight to this. Whether it's true, and if it is, why? I appreciate any info I can get my hands on.