Grumpyre

"Another of the mysterious Ethereals, you can never fully tell what kind of mood the Grumpyre is in. Thanks to its shifting eyes and mouth as it gurgles forth its song, it might appear sad when really it's happy, or afraid when it's actually having a blast. This makes sense, since it embodies the essence of Shadow - always a bit obscured, and able to unnerve even the most intrepid of Monsters."

Description
The Grumpyre joined the song on August 19, 2013. The monster resembles a gray-black bat creature surrounded by a cloud of smoke. It has two pairs of red bat-like wings full of holes, two arms, but no legs or ears; it occasionally goes cross-eyed.

In the 1.3.1 update, released on December 5th 2014, eyebrows were added to the Grumpyre, occasionally emerging during its animations.

When this monster is idle, it stays in tempo by flying in a style similar to the Tweedle, dangling its arms, and making various facial expressions.

Song
Audio sample:

The Grumpyre sings "boom-Shicka-la-Shicka, boom-Shicka-la-Shika" in a harsh whispering voice. It does this repeatedly for its part in the Cold Island song. In Ethereal Island, it sings "boom-shika-La, boom-shika-la-la-la-la boom-shika-la, boom-shika-la-la, boom-shika-la, boom-shika-la-la-la-la Boom-shika-la, Boom-shika-la-la"

Breeding
The Grumpyre can be bred using a combination of a Deedge and one three-element monster. Possible combination(s): ​There is roughly a 1% chance of breeding this successfully. It is uncertain whether some combinations work better than others. According to statistics, doing 70 attempts gives you a 50% chance of successfully breeding at least one Grumpyre; and doing 690 attempts gives you a 99.9% chance of successfully breeding at least one Grumpyre. Note that a Rare Monster could substitute any of the parents. The only exceptions are "Ethereal Breeding Bonanzas". These increase the chance of breeding an Ethereal by 500% (5x).
 * Deedge.png + Congle.png Deedge and Congle
 * Deedge.png + Bowgart.png Deedge and Bowgart
 * Deedge.png + Spunge.png Deedge and Spunge
 * Deedge.png + Thumpies.png Deedge and Thumpies

Earning Rate and Maximum Income
Earning rate is in coins or shards per hour and depends on Happiness % (Likes increase Happiness), also each monster has a limit to how much income it can hold at a time. Increasing the monster's level increases the limit.

Feeding Monsters
Each monster needs to be fed four times before it reaches the next level. Increasing the monster's level increases the coins earned per minute. The food per level is the same for all Ethereal element monsters and can be found in this article. With the Ethereal Island update, Ethereal monsters can achieve level increases to level 15, and may be placed on Ethereal Island instead of Gold Island.

Strategy
Some items to take into consideration when designing your island by strategy are number of beds for the monster, rate of income per bed, max income per bed, and time for max income to be reached. The income below is for level 15:

Name Origin
The name "" may be a portmanteau between Grumpy and Vampire, due to the ambiguous facial expressions that the monster makes and to its bat-like traits.

Christmas
Ethereal Island had been Christmas-free until December 2015, when the Grumpyre became the first monster to dress up at Ethereal Island. It appears that the Grumpyre wears a wreath around its neck to suit its own feeling of Christmas.