Mission name: Frozen Legend
Mission rank: A
Objective: Kill or subdue the sea dragon
Location: Mizu No Kuni - Temple Ruins
Reward: 300 Ryo Dead / 500 Ryo Alive
Mission description: An extremely rare summon which belonged to a Kirigakure Jounin has failed to come to their contractor's aid multiple times. A similar creature fitting the summon's description has been attacking those of the village who wander near the temple ruins. Before heading over to the ruins though, you must double check the location. The jounin should tell you where the summon usually resides/inhabits, which should match the location of the attacks, and it will be up to you to decide whether to kill or to exhaust the summon. Be advised that the Jounin did agree to assist in any conflict that occur, but specifically stated that they receive a cut of the pay.

Mission details: Those taking the mission should be informed by the NPC Jounin where the summon resides. The location of the NPC will be up to the player (in town, by the ruins, etc.), but they MUST include that they have been informed. Then, at the temple ruins, they will find the summon lying on/coated in a thin sheet of ice (which it can easily shake off) and will do battle with it. Eventually, the summon becomes exhausted, leaving a choice of killing or simply letting the NPC jounin determine the outcome. (Note that if the jounin, not the player, chooses to kill the summon, or if the Jounin assists in the battle with the summon, they will receive the 'dead' ryo reward).

Summon:

Jounin NPC:

*Note that whatever jutsus the summon or Jounin uses when fighting, or what outcome the Jounin chooses will be up to the player.

Code:

Since this is a summon, this summon's stats should be all A-2 stats. For more information to make this NPC summon more legal to use in this mission follow the Summon Guidelines for the techniques this summon can use, its elements, and the size of the creature itself.

http://www.narutosaga.com/t12293-summon-rules