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A strange beast infused with magic. Its color, appearance, and abilities are determined by the types of magical essences it was exposed to while still an egg.
This courier's appearance is determined by the types of Essences it was exposed to while still a Greevil Egg. Players could use their Greevils in Frostivus 2012's The Greeviling game mode, where each Greevil was given a set of abilities.
Each Greevil courier has a set of possible cosmetic properties that differ depending on the Essences that were used on its egg.
|Property||Associated Color||Essences Used||Result|
|Horns||Red||1 Exort Essence||Stubby Greevil Horns|
|2 Exort Essence||Wicked Greevil Horns|
|3 Exort Essence||Massive Greevil Horns|
|Shadow Essence||Demonic Greevil Horns|
|Teeth||Orange||0 Wex and Exort Essences||Simple Greevil Teeth|
|1 Wex and Exort Essences||Sharp Greevil Teeth|
|2 Wex and Exort Essences||Toothy Greevil Teeth|
|Shadow Essence||Jagged Greevil Teeth|
|Tail||Yellow||1 Wex Essence||Thin Greevil Tail|
|2 Wex Essence||Balanced Greevil Tail|
|3 Wex Essence||Spiked Greevil Tail|
|Shadow Essence||Evil Greevil Tail|
|Hair||Purple||1 Quas and Exort Essences||Short Greevil Hair|
|2 Quas and Exort Essences||Long Greevil Hair|
|Nose||Blue||1 Quas Essence||Modest Greevil Nose|
|2 Quas Essence||Hooked Greevil Nose|
|3 Quas Essence||Horned Greevil Nose|
|Ears||Green||1 Quas and Wex Essences||Perky Greevil Ears|
|2 Quas and Wex Essences||Pointed Greevil Ears|
|Wings||The greatest amount of duplicate Common Essences affects the scaling of the wings||0 or 1 duplicates||Barely Functional Greevil Wings|
|2 duplicates||Functional Greevil Wings|
|3 duplicates||Elaborate Greevil Wings|
|Shadow Essence||Gothic Greevil Wings|
|Eyes||None||Doesn't matter||Googly Greevil Eyes|
|Feathers||Black||Shadow Essence||Shaggy Greevil Feathers|
Up to three Unusual Essences could be socketed into a single Greevil Egg, and each increased the intensity of the particle effect corresponding with the color of the hatched Greevil courier: the first imbued Unusual Essence resulted in a general aura effect, the second added a searing eye effect, and the third added a particle trail.