Sickle

Description
Sickles are a type of axe with two skins. The first skin shown (which originated in Prophecies) is that of the double-bladed type with a distinct rounded head, while the other (which originated in Factions) is more similar to the traditional farming implement with a crescent blade and a short handle.

Location
Both Tyrian and Canthan Sickles are random drops.
 * The Tyrian version seems to drop more often in low-level areas of Prophecies such as Pre-Searing and can also be found in GW:EN.
 * The Canthan version is quite common and can drop with max stats in later areas of Factions as well as in Nightfall and GW:EN.

Double-bladed skin
Prophecies campaign
 * Ascalon (Also in Pre-Searing Ascalon)
 * Charr
 * Gargoyles
 * Northern Shiverpeaks
 * Frostfire Dryder
 * Shiverpeak Centaurs
 * Snow Ettin
 * Kryta
 * Ettin
 * Mergoyle
 * Reed Stalker
 * Maguuma Jungle
 * Maguuma Spider
 * Moss Scarab
 * Thorn Devourer
 * Wind Rider

Factions campaign
 * Shing Jea
 * Sickened Guard

Nightfall campaign
 * Istan
 * Fanged Iboga
 * Rinkhal Monitor

Eye of the North expansion
 * Caverns Below Kamadan
 * Corsair Raider
 * Far Shiverpeaks
 * Avalanche
 * Chilling Wisp
 * Spectral Vaettir
 * Charr Homelands
 * Dalada Uplands
 * Dungeons
 * Catacombs of Kathandrax
 * Locked Chest
 * Darkrime Delves
 * Ooze Pit
 * Secret Lair of the Snowmen
 * Locked Chest
 * Slavers' Exile
 * Selvetarm (Dungeon)

Crescent skin
Factions campaign
 * Shing Jea Island
 * Kappa
 * Sickened
 * Sickened Guard
 * Kaineng City
 * Jade Brotherhood
 * Echovald Forest
 * Luxon Warrior
 * Urgoz's Warren
 * Dredge
 * Maddened Dredge
 * Maddened Dredge Savage
 * Maddened Dredge Seer
 * Greater Blood Drinker
 * Plants
 * Thorn Wolf
 * Twisted Bark
 * Uprooted Malice
 * Jade Sea
 * Creeping Carp
 * Irukandji
 * Kurzick Juggernaut
 * The Deep
 * Ripper Carp
 * Leviathan Fish
 * Leviathan Head
 * Leviathan Mind
 * Outcasts
 * Outcast Assassin
 * Outcast Deathhand
 * Outcast Reaver
 * Multiple regions
 * Afflicted
 * Afflicted Mesmer
 * Afflicted Ranger
 * Afflicted Warrior
 * Shiro'ken
 * Shiro'ken Elementalist

Nightfall campaign
 * Istan
 * Plains of Jarin (Hard Mode)
 * Stalking Nephila
 * The Desolation
 * Sadistic Giant
 * Realm of Torment
 * Madness Titan
 * Rain of Terror
 * Margonite Chests

Eye of the North expansion
 * Dungeons
 * Heart of the Shiverpeaks
 * Mountain Heart Chest

Dye

 * Dye can be applied to the double-bladed, Tyrian sickles but has no effect on their equipped appearance.
 * When applied to the crescent-shaped Canthan sickle, it affects the color of the blade. These are dyed yellow by default.