War of the Underneath
From Tardis Wiki, the free Doctor Who reference
The War of the Underneath was a war involving the Shadow Kin. Corakinus led them in battle. (TV: Co-Owner of a Lonely Heart) One part of the war was an attempt at invading Coal Hill Academy, which was foiled by the Twelfth Doctor, a group of students and a teacher. (TV: For Tonight We Might Die)
