Hitching a ride with its Common Seasonal cousin, the Rare Yool journeys to Cold Island each year to ring in the heart-warming Festival of Yay with its fellow Monsters. Legend says it was once a curmudgeonly loner, preferring to spend time by itself - but once it discovered the joy of friendship, it sprinkled its beard with scrumptious candy and resolved to hold the message of goodwill towards all Monsterkind in its heart, no matter the season.
~ In-game description


The Rare Yool is the third Rare Seasonal Monster to be introduced to the game. It arrived on December 2nd, 2016 during the Christmas celebration, also known as the Festival of Yay.

Unlike its common counterpart, the Yool, the Rare Yool has four dark brown antlers that each have three silver bells attached. Its shirt is forest-green with darker hued snowflakes, and the sleeves are yellow and red. Its legs, beard and face are all brown (the latter is a lighter shade), and multi-colored sprinkles are visible on its beard. It also has two sprinkles for eyebrows and it has a red nose. The Rare Yool shares the same animation as the regular Yool with no notable differences.


Audio sample:
Memory Audio CR

The Rare Yool shares the same audio as its common counterpart, the Yool. It sings/plays the following on each island:

  • Gold Island - "Ho Ho Ho Ho *Ching*" with a bit deeper tone

The Rare Yool's contribution to an island's song is a resonating baritone voice, reminiscent of that of Santa Claus. It also shakes its head quickly which causes its bells on its antlers to jingle.


The Rare Yool can only be bred for a limited time within the Christmas celebration; it is not available for the celebration's full duration. There is only one combination:

For 2016, the breeding availability period was from:

  • December 2nd 17:00 UTC - December 6th 20:00 UTC
  • December 13rd 20:00 UTC - December 15th 20:00 UTC
  • December 23rd 20:00 UTC - December 30th 20:00 UTC
  • December 30th 20:00 UTC - January 2nd 20:00 UTC

For 2017, the breeding availability peroid was from:

  • December 7th to December 10th 20:00 UTC

NOTE: The Rare Yool can only be bred or purchased during the dates listed above. Any Rare Yool on Cold Island and its Mirror Island that is obtained during the above times will stay unless it is sold.

Earning Rate and Maximum Income

Earning rate is in coins 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.

Level Per Minute Coins 2.0 Maximum Coins 2.0
0% Happiness 25% Happiness 50% Happiness 75% Happiness 100% Happiness
1 8 10 12 14 16 3,570
2 15 18 22 26 30 5,712
3 22 27 33 38 44 8,568
4 29 36 43 50 58 11,424
5 36 45 54 63 72 14,280
6 43 53 64 75 86 17,136
7 50 62 75 87 100 19,992
8 57 71 85 99 114 22,848
9 64 80 96 112 128 25,704
10 71 88 106 124 142 28,560
11 78 97 117 136 156 31,416
12 85 106 127 148 170 34,272
13 92 115 138 161 184 37,128
14 99 123 148 173 198 39,984
15 105 131 157 183 210 42,840
16 110 137 165 192 220 44,982
17 114 142 171 199 228 46,781
18 118 147 177 206 236 48,184
19 120 150 180 210 240 49,148
20 121 151 181 211 242 49,639

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, as well as the maximum coins earned. The food per level is the same for all Rare Seasonal Monsters as well as Triple Element Monsters and it can also be found in this article.

Level Food 2.0 Per Feeding Total Food 2.0 Needed Per Level
1 10 x4 40
2 20 x4 80
3 40 x4 160
4 80 x4 320
5 160 x4 640
6 320 x4 1,280
7 640 x4 2,560
8 1,280 x4 5,120
9 2,560 x4 10,240
10 5,120 x4 20,480
11 10,240 x4 40,960
12 20,480 x4 81,920
13 40,960 x4 163,840
14 81,920 x4 327,680

It takes 655,320 Food 2.0 to get a Rare Seasonal Monster from level 1 to 15.


  • YoolGo to Yool
  • HarpsitreeGo to Harpsitree
  • Flappy FlagGo to Flappy Flag
  • Tree Forte TowerGo to Tree Forte Tower

Every monster has different things that they like. For every unique object that they like that's placed near the monster (if not using a Unity Tree), the monster's happiness will increase by 25%. Placing two of the same liked item near a monster will still only increase happiness by 25%. Below are the things liked by Rare Yoool:

See the Likes page to view a complete list of all monsters' likes.


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

Number of Beds 1
Rate of Income High 210 Coins 2.0
Rate of Income Low TBA Coins 2.0
Max Income 42,840 Coins 2.0
Rate of Income per Bed High 210 Coins 2.0
Rate of Income per Bed Low TBA Coins 2.0
Max Income per Bed 42,840 Coins 2.0
Time to Max Income @ High 03:24:00
Time to Max Income @ Low TBA

NOTE: The time to max income is shown as (Hours : Minutes : Seconds).

Possible Monster Names

The following are the possible names that will be given to a Rare Yool by default.

Blitzen Danka Dashow Dodder FraTra Howl
Kommut Kyupit Mondha Priyanka Stu Teetor

Name Origin

The name "Yool" comes from the name of an ancient pagan mid-winter festival, Yule, which was later absorbed into Christmas. Yule is short for Yuletide, and wool, coming from a sheep. Usually white for regular Yool, but for rare Yool they probably dyed it brown.


Rare Yool available

The Rare Yool as it appeared in the News

Rare Yool memory

The Rare Yool in the Book of Monsters prior to its release

  • The Rare Yool was the third Rare Seasonal Monster to be introduced to the game and it appeared in the Market for four days and three hours from December 2nd, 2016 to December 6th, 2016. Originally, it was intended to leave on December 5th, however the time was extended by one day.
  • A teaser of the Rare Yool can be seen on the start-up screen for the 2016 Christmas season at the bottom. It also appeared in the Book of Monsters three days before its official release.
  • There was a glitch that caused the Rare Yool to not appear in the Mirror Cold Island Market. This was fixed a few hours after it became available in the Cold Island Market.
  • The Rare Yool's red nose is similar to that of Rudolph the Red-Nosed Reindeer.

Breeding Eggs Feeding Likes

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