Let me bring a little light to why Blazing Spirit on the force swords sucks.
Number 1: Wildfire is bugged and not working properly
Wildifre currently suffers from the following bugs:
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Wildfire has a hidden cap of 4 stacks. That is, targets having 5 or more stacks of Soulblaze cannot be targeted by Wildfire regardless of the stacks on the original target and targets with 4 stacks consume a stack but only refresh their duration.
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Original targets that have only one stack of Soulblaze cannot trigger the effect.
The combination of these makes it very hard to get any proper value out of the feat as it usually can only proc when the mobs on the edge die and it will decay very quickly due to spreading the stacks evenly to mobs in range and not being able to spread a single stack further. The proc range of 5 meters does not help.
Number 2: Blazing Spirit is applied after the damage IF the target survives
Crits do more damage, with Force Swords being the Assassin type, they get a good bonus for their weakspot and crit damage. That being said, a crit often ends up killing the target which results in no Soulblaze, so you need your target to live after the crit. This is bad design in a game where you want stuff to die as fast as you can.
If the Soulblaze effect was applied before the damage, one could get a lot more Wildfire and Ascendant Blaze warp charge procs from the critical hits.
Number 3: Not enough crit chance
This could be potentially fixed if Number 1 and 2 is fixed, but for the current iteration you just don’t have enough constant crit chance to get a good value out of Blazing Spirit. You could also use Illisi with +5% crit chance and Shred 4 or Bloodthirsty, however this brings us to…
Number 4: Using the wrong Force Sword, but it still doesn’t matter
You absolutely need to use the Illisi force sword for this as it is the only one that actually has good horizontal strikes to apply the effect on as many targets as you can. However, even with Shred 4 or Bloodthirsty, you end up with the problems of Number 1 and 2. Illisi usually just ends up killing the targets leaving very little enemies with the Soulblaze effect. You are just better off stacking Slaughterer with something else like Unstable Power or Executor.
EDIT:
Now someone could say you could combine Deimos with Blazing Spirit 4 and Bloodthirsty to beef up your single target damage with the special attack but it’s a bad idea. Firstly, you need to special an enemy to get it going. Secondly, the special locks you in an animation where you are unable to defend yourself if needed. This game is mostly fights where you are out numbered, if you stand still in melee range you die.
The Deimos 2nd heavy can already one shot a mutant with correct blessings and +maniac so there is no reason to use the special other than finishing a lone elite with style points.