I've been farting around with Touch of Malice and The Stag, which I have never used before. I've found that the Resist x3 granted by Well of Tenacity is being removed when casting any rift. It is removed from the HUD, and self damage using ToM is the same as not having any damage resistance. As for The Stag, its Resist x2 is hidden on the HUD by "Void Buddy Ready" from the Child of the Old Gods aspect. This does not matter though, because the Resist x2 does not seem to be functioning in any meaningful capacity, at least compared to Well of Tenacity. When using ToM, 70 Resilience, and no Stag, I can survive the self damage of 19 shots. When using ToM, 70 Resilience, and Well of Tenacity (Resist x3 / 50% DR) I can survive 24 shots. When using ToM, 70 Resilience, and The Stag (Resist x2 / 25% DR) I can survive 19 shots, and have genuinely something like 5 more HP left over vs. no Stag.