Earl Tail is a Legends of Idleon item: dropped by 1 monster, used in 1 recipe, quest reward. Earl ain't got no tail no more.

Earl Tail | Idleon Toolbox

Earl_Tail

Hold down to instantly regenerate the Spelunking Stamina for all your players!

Hold down to instantly gain 2 Hours of Research progress! That includes Minehead currency too!

On the plus side, it reflects light in a cool way. On the minus side, that probably makes it carcinogenic...

The balloon floated away, so these scales are all you get!

Gather 100 Equinox Flesh, Earl Tails, and Scaled Fragments from World 7 monsters to unlock the World 7 tasks!