User blog:Twentypence/More information on Dragon Pages

"This Monstrous Nightmare seems uniquely trained... to do the exact opposite of whatever Snotlout says! But they still make a great team."

Hookfang is an unique [Monstrous Nightmare] dragon of the [Stoker Class].

Aquisition
Hookfang is unlocked for purchase in the shop after rebuilding Snotlout's home.

During the first day the price is discounted, so it is recommended that players ensure they have enough runes before rebuilding Snotlout's home.

Price: 1000 Runes (500 for 24 hours after completing Snotlout's House)

Purchasing Hookfang completes a quest that provides a reward of 300 Runes.

Egg Design
Unfortunately with premium dragons like this one there is no egg. Once you make the purchase it will go directly into your village.