Can WAT rune Horrid Decrepify stack with Abhorrent Decrepify? (I think no)

The WAT rune will cast Horrid Decerepify.

If we use this rune and spec our necro into the other path, Abhorrent Decrepify, are these considered two different debuffs? Or do they overwrite?

I tried to do some testing with elites out on the map, and my testing say NO, it does not look like they stack…

The way I was testing, I put WAT on the activate of a healing potion, I took a mob down below 10% and kept doing small Reap autos while hitting the potion, and it never died…

No it can’t and it also shouldn’t. So working as intended.

It works if and only if (1) WAT + abhorrent skill tree AND (2) DO NOT cast it manually.
You can find videos and builds use this mechanism.