ReZERO -Starting Life in Another World- Vol 30 light novel

Description:

Chaosflame is facing an unprecedented disaster that, if left unchecked, will mean the end of the empire! As those gathered in the city continue to fight, Abel resolves to seek out a certain astrologist who might hold the key to victory. At the same time, the bad news reaches Rem—a terrifying girl leading a swarm of dragons has arrived, and all hell is about to break loose!