There was only so much Alchemical tools could do.
Any Awakened would counter white phosphorus with darkness and light fusion, using the former to destroy the foreign substance while not experiencing pain and the latter to recover from its damage.
As for fake mages, any of them capable of posing a threat to Lith was bound to have enough protections to be immune to his grenades. Just like the mines, Lith had employed them only to stall for time and save as much mana as he could.
The barrier ring and the mana boosted Scalewalker armor blocked the first volleys of spells, but there was just no end to them. As the alarm resounded throughout Kolga, more and more people rushed to the King's tower and to the Light Torch academy.