The coil is your reward, your blindness, and your clock. Pick your moment.
Serpents thread the walkways toward your keep. Your garrison fires straight down corridors — and a corridor packed with coil is a corridor your guns cannot see through.
Charges are the answer. A charge hits every segment in its radius, and it hits harder for each one it catches. Waiting makes the blast bigger, your guns worse, and the keep closer to falling.
Tap a charge to detonate. Tap an empty plinth to post a soldier for 30 embers.
The watch holds. Take one.