"Burn has promised us immunity from attack for the next hundred years if we help her win. If we don't — she'll destroy us. She is a powerful enemy, little SandWing. A lot more powerful than you, and she's an enemy I don't intend to make."
Moorhen is huge, as big as Morrowseer and taller than her siblings. She has russet-brown scales and wears gemstones on her ankles and head.
Moorhen is a protective queen, both of her tribe and her siblings; she seeks for the option that most ensures the safety of her tribe, as seen when she joined Burn's side of the war when she threatened to attack the MudWing tribe if Moorhen refused to fight with her. According to Sora, Moorhen is a good queen and is loved by her fellow MudWings. In The Brightest Night, she fretted over how many dragons are dying and how it was her fault she did not protect them well enough.
Moorhen also appears to be skeptical, saying that Sunny's plan to stop the war with no more dragons dying sounded like "a tale from one of the SeaWing queen's silly romantic scrolls" and Sunny was very small to be in charge of saving the world.
Coral states that Moorhen has "such interesting ideas." She is logical, and would not want to put her tribe through more war.
When the dragonets of destiny and Webs are walking through the Rainforest Kingdom, Tsunami notices some MudWings heading their way but notes that they couldn't possibly see the dragonets. in the fog. Starflight suggests that they should hide because they were only a day's flight from Queen Moorhen's palace and that they wouldn't want to get caught and be imprisoned. Glory also sarcastically said that Moorhen probably would not give them tea and send them on their way if they met her.
In the prologue, Pheasant asked why she and her siblings have to fight in the War of SandWing Succession, and Reed replied that Queen Moorhen must have a good reason to ally with Burn and the SkyWings.
Moorhen gathered her army to prepare for an invasion of the Ice Kingdom along with her SkyWing allies, in which they planned to wipe out the whole of the IceWing forces. Sunny visited Moorhen during one of her nightmares using a dreamvisitor to warn her about the battle. Sunny managed to convince her not to go through with the invasion because it would kill too many dragons on both sides, then told her to arrive at Burn's stronghold a few days later for the peace summit. Although Moorhen did agree to try, she was still unsure it would solve anything but was present at the stronghold at the end of the book for the crowning of Thorn. Also, while this was unbeknownst to all but the IceWings, the Great Ice Cliff would have slaughtered the entirety of Burn's attack if Moorhen had not believed Sunny.
At the beginning of the book, Scarlet arrives at Jade Mountain to throw the decapitated head of Queen Glory at Queen Ruby, her SkyWing guards, and the dragonets of destiny before fleeing. With the help of Turtle, the group discovers that the head is actually a MudWing head enchanted to look like Glory, and Ruby decides to contact Queen Moorhen and let her know that Scarlet has killed one of her subjects and therefore must be around her swamps to get to a MudWing.
Queen Thorn mentions Moorhen, saying that she should send a dragon with an earring enchanted to protect her from Darkstalker. However, the book misspells her name, spelling Mudhen instead of Moorhen. In the epilogue, Coral mentions in her letter to Turtle that she is rebuilding the Summer Palace and hopes it will be a center of trade and diplomacy, especially with Queen Moorhen and Queen Glory.
Snowfall mentions that Moorhen is her favorite out of all other queens because she is calm. During the queens' meeting, Moorhen says that there isn't enough room in the Mud Kingdom for the refugee dragons and later sends Bullfrog as the MudWing representative to go to Pantala.
While never appearing, one of her generals, Swamp, and at least two of her guards met with Tempest, Blister, and the SeaWings at the time of Tempest's murder. One of the guards reported the news of what happened and subsequently, she broke off her alliance with Blister. Due to these events, Burn was able to threaten her into allying with her.
"But then the war will be over, and perhaps that'll be worth it. Burn has promised us immunity from attack for the next hundred years if we help her win. If we don't — she'll destroy us. She is a powerful enemy, little SandWing. A lot more powerful than you, and she's an enemy I don't intend to make."
"You want us to send our soldiers all the way to the other side of the ocean. To fight in a war that — I'm so sorry, but — it has nothing to do with us. Our dragons are safe here. That thing over there doesn't even know about us. If we go rile it up, it might come back to attack us and we could lose this continent, too. At least right now, this is a safe place — for us and for you."