Spellcasters laying a lattice of protection spells over each granite block of the Nest.
A group of newly-arrived mages, fresh from shoring up The FUPA, begin the process of protecting The Nest's individual pieces. They will spend the two hours before Open Hostilities painstakingly moving up the tower, creating a lattice pattern of protection spells on each block — up to fifteen per block, with several bleeding to neighbors to average more than twenty across the structure.
Because they are outsiders working on the one thing Operation Ruin cannot survive losing, Carl has two crawlers from Elle's team watching them closely to make certain none are spies or Worm Heads. More mages will be stationed on the tower's lower floors during the battle.
A working party of spellcasters moving methodically block by block up a granite tower.
The spellcasters enchanting the Nest, and a potential infiltration vector.