The New Mutants Annual #5 [Direct]-Near Mint (9.2 - 9.8)

Ghaur and Llyra steal the Horn of Doom from Namorita. Namorita believes the New Mutants stole it and goes after them. Ghaur blows the horn, which brings a monster that destroys Atlantis. Namorita and the New Mutants recover the horn.