I didn’t get any spark from Lilith in any Torment level.
Also, no spark defeating any tormented boss in T4 (I defeated all, including Lilith).
Please, don’t do more unobtainable a mythic. They are already hardest to get than ever.
Reward fairly that sparks.
              
              
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          Can confirm, also didn’t get any spark (or any loot) from Lilith on T4 (or lower). Got one from Duriel on T4.
              
              
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          I also just defeated uber lilith for the first time T1 and did not get a spark. I spent a lot of gold repairing my equipment from many deaths. So dissapointing. This was on my character kyliehawk