The mana roots kept growing, the more they fed on the mana pool that the team provided. Their mana pools were eventually emptied, which was alarming, but they still kept at it because they weren't in any direct danger right now.
The team kept pouring every bit of mana that they generated themselves, and at this point the roots had grown so big that even Gustav and the dragons who were above the water, were getting every drop of their mana sucked in by the roots! The dragons didn't have many points to spare to begin with, but they lost theirs as well.
Each root was as thick as a tree now, as most of them were four feet wide, while their ending tips were six inches wide! They were gigantic, and one could say that it was difficult to find roots like this under natural circumstances, no. The only other root that Tim and Ortana had seen, for example, was tiny in comparison. Eighteen of these thick boys were bound to make their mana quality godly!