By the Book

Requirements to Unlock: Complete Ruff Draft quest.

Raise a Smothering Smokebreath to Level 78

Raise a Monstrous Nightmare to Level 78

REWARD: 75 Runes and 100,000,000 Fish

Unlocks Quest: ??

Note: Other Monstrous Nightmare dragons like Battle Monstrous Nightmare, Fanghook, Girl-Hookfang, Hookfang, Hookfang's Mate, Hookfang's Offspring and Valka's Mercy also count.