“25% life force and <25% health. How helpful is anything that doesn’t protect you in that situation?”
You clearly don’t know how this trait works. It revolves around your NORMAL health pool. As was stated above that most people don’t seem to understand is that DS IS NOT HEALTH. If you cant stack at 50-75% DS in a 1v1 before you die, then you are completely garbage. Anyway, back to explaining this trait to you. Lets just say you’re in a 1v1 and you get all the way down to below 25% of your normal health pool. As soon as hit that threshold siphoned power is activated. If you pop DS it is still activated and every time you get hit you gain might. It doesn’t matter if you have 95% DS or 10% DS, siphoned power will still give you might every time you are hit while your NORMAL health pool is below the 25% threshold. So you can be at 90% DS and get might every time you are hit as long as your NORMAL health pool is below 25%.
If you dont think this is useful, then let me give you a situation that isnt crazy and farfetched. As a normal 1v1 is playing out my opponent and myself have both used a majority of our cooldowns. My opponent then thinks he has the match in the bag, but what he doesn’t know is that i have been saving my DS (because I’m smart and i know how to use a necros skills in a power build). So he gets me down just low enough to activate siphoned power and doesnt have much burst left (because he used it trying to kill me) , i pop into my 50-75% DS. Since he doesnt have his bursts ready, he cant take me out of DS very fast, and every time he hits me i gain might, along with every time i use life blast i also gain might. Pair this with the trait “vital persistence” and his attacks will do even less damage to my life force. So now we are both on cooldowns my health pool is below 25% and he has no means of effectively taking me out of DS, each time he hits me he buffs my already powerful DS auto attack 1. lets say he hits me 5 times, thats 5 stacks of might. In that time i will also hit him 5 times with auto attack 1, thats another 5 stacks of might (10 stacks total in what like 10 seconds). Now my DS is almost gone, and he somehow doesnt die from my 5 auto attacks, I use my fear and life blast him to death. Game, set, match.
You also say that 5 seconds isnt long enough of a duration, or that only a necro in downed state can give you a good amount of might stacks from this trait, then you dont understand how most of the other classes work either. There are a good amount of classes out there that focus on hitting you multiple times in a very short period of time, which exactly what you want when trying to utilize this trait. So please learn ALL of the skills before you ask to nerf yourself into the ground.