So I feel Phearomones is probably DK’s best pve Legendary among those useable by all specs, and because I went Night Fae and play Unholy, I’m planning on using it for the Death’s Due window, interrupt/stun utility in Mythic+/Torghast, and because I have no idea for when the WB that drops Frenzied Monstrosity will appear (and Frenzied Monstrosity is kinda boring tbh). I can afford to be suboptimal because I’m not a mythic raider. 
That said, does anyone know the drop rate on The Great Vault memories? Is it a guaranteed drop as long as you have a weekly chest to open, or should I prepare to play the rng game every week after that first week of raid?
the Great Vault memory is guaranteed provided you have something to open. And like you I’m also torn between crafting it and waiting for Frenzied Monstrosity. It really seems good and the phearomones proc has been a life saver in Torghast when I’ve gotten it as an Anima power.
It’s solid, not the best for M or raids but it’s not gated behind raids or the RNG of the weekly raid world target. I made mine last night at 210 and will probably switch to Frenzied Monstrosity when I eventually get it for the focus on M+.
I crafted it last night. It’s a solid proc. It helps with Unholy’s downtime a little bit. In AOE/cleave it’s obviously useful but I can see it being useful in ST. I haven’t had much time to test it since I crafted it but I do feel like it’s a solid investment. Plus it’s not going to take THAT long to get the soul ash for another legendary.
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