Speak to Rakshatta on the dock in The Enchanted Lands -28, 0, 50 . Collect bits of patchwork creatures. These are auto-updates that aren't rare, even though it may not happen every kill. You will either be sent for "creatures" (any patchcraft will do) or a specific type of patchcraft creature.
There's a chart of Patchwork creature spawns at Patchwork Slayer Achievements.
Your choice of:
Occurs annually around April Fool's Day.
Special one-day events on April 1st!
(Introduced in 2015)