I expect that Lestilaut would have been able to use the mana absorbed by the shield too, if it hadn’t crumbled into golden dust. The whole point of black feystones is to capture mana, not to disipate it after all. Lestilaut would probably have even been able to safe the shield from being destroyed by taking out the mana Rozemyne was pouring into and casting some spells with it.
His prosthetic seems really powerful. More powerful than Dunkie’s black shield it seems, since it absorbs and reflects.
I expect that Lestilaut would have been able to use the mana absorbed by the shield too, if it hadn’t crumbled into golden dust. The whole point of black feystones is to capture mana, not to disipate it after all. Lestilaut would probably have even been able to safe the shield from being destroyed by taking out the mana Rozemyne was pouring into and casting some spells with it.