With some investigation, I believe I've narrowed it down to the BetterPvP mod. Specifically, its Entity Info(think DamageIndicators) feature - when the entity info would normally pop up on my screen, the whole screen goes black, or sometimes other weird graphical issues will happen instead such as the sun turning black, or part of the chatbox turning black. This is on an AMD Radeon RX 480. My buddy has the same issue, using an NVIDIA GeForce GT 755M. He says looking at one of your mobs with ToroHealth, a similar mod, causes the same issue. This is on Lycanites 18.104.22.168, and doesn't happen with any vanilla mobs or mobs from other mods. It can happen with just Lycanites and BetterPvP installed, with no other mods.
Could you try it with the latest 22.214.171.124 build, there was a strange rendering issue related to the new alpha blending I've been experimenting with that has been now fixed which could be related. I use an AMD Radeon RX 580 myself so can pretty much rule out GPU related issues.