I do not like these Teth rifts myself, though I have not seen one that kills me in 3 seconds - I usually get stuck in phase 4(?) where you have to stop 10 mobs from reaching the Teth, and most of the time end up with 9/10. No idea if I'm to slow, or if the rifts are just bugged.
Anyway, if you have a crafting profession the easiest way to avoid this is to join one of the crafting lure groups that are formed in public chat. This way you have a small chance at imperishables and hearts, and can easily finish the rift weekly without having to deal with any of the annoying Teth rifts.
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Too many Teth rifts!
