Talk:Sentient Cores/@comment-89.205.125.193-20171016215421/@comment-2600:387:A:8:0:0:0:5D-20171017013236

The Vomvalysts have a 100% chance of dropping their 'Soul', or their 'Energy.'

This is the small glowing orb you see that makes the same sound as Reactant when you pick it up. Eidolon Lures use these to charge. Sentient Cores have a lower drop rate, and are half the size of the orbs of energy. They do not drop with every kill. It's not a bug, just more grind.