I slot two, because my build is different than most. I run assault and tactics and strive to stay in human form, so when Im done fighting a tough group, my blue bar has most times bottomed out, and stygian will fill it up again off of as little as 2 minions.
I dont use stygian for staying alive, I use it to move on to the next group faster than if I waited for natural recovery or rest to occur. I use essence drain to stay alive mid battle.
-Largo
Founder of A.G.O.N.Y. Supergroup on Victory
Member of Thought Sanctum VG on Victory
Member of St0rm Batallion SG on Guardian
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One end mod. I've never needed anything more.
If I am in situations where I regularly have to hit Stygian every 15 seconds for the sake of staying alive, then I need to be out of that situation.
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If I am not in situations where I regularly have to hit Stygian every 15 seconds for the sake of staying alive, then I really need to up my slider and quit slacking. 
If you PL'd to 50 just to get an "epic" thinking you'd be �ber, you're going to be sorely disappointed with the HEATs, because the VEATs were designed so that anyone with one good finger and a braincell can rock the toggles.
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If I am not in situations where I regularly have to hit Stygian every 15 seconds for the sake of staying alive, then I really need to up my slider and quit slacking.
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You're a good Purple and Black Soldier, Soldier! 
I believe that a Kheldian Gold Standard should be based on SO's, and for anything above that... there's Platinum!
Save Ms. Liberty (#5349) � Augmenting Peacebringers � The Umbra Illuminati
Save Ms. Liberty (#5349) � Augmenting Peacebringers � The Umbra Illuminati
I think I have mine (over) slotted with 2xEndRedux, 2xRecharge, and 2xEndMod...honestly, it's been a while since I even looked at my slotting >.< I just know that, sometimes, I have to fire it to get enough endurance to summon a pet, and that it recharges fast enough to fire again off that same corpse...
In general, I use it whenever it is recharged and there is a corpse available, overkill for sure at times, but it's the only self-heal I have in human-form.
One end mod. I've never needed anything more.
If I am in situations where I regularly have to hit Stygian every 15 seconds for the sake of staying alive, then I need to be out of that situation.