After killing the Bone Spider Mother, Lu Hong immediately collected the two fragments of soul power split from the enemy, one infused into Archimonde's body and the other into Liesuotus's body.
As for why he did this, Lu Hong was simply grasping at straws in desperation, as these two are currently the leaders of the Hell Demons; if they were gone, how could the Hell Demon Clan possibly fight against the Undead Heavenly Calamity?
Additionally, Lu Hong felt heartache for these two former old friends; they couldn't just die like that!
The Demon Clan has the characteristic of absorbing and devouring soul power to strengthen themselves; perhaps the soul fragments of the Bone Spider Mother would have some effect on them.
Evidently, Lu Hong's guess was correct; the two streams of soul power entered the bodies of the two great Demon Lords, and Archimonde and Liesuotus started to tremble.
