any idea how to obtain goodness chaos?

From the Update Notes:

New Event Cards and Event Card Collection System

Event Cards and the Event Card Collection system have been added.
The new Event Card Collection UI can be accessed through the Event List (default shortcut key: [V]) next to the scrolling ticker.
Complete certain qualifying events to receive a stamp in the Event Card Collection UI. Qualifying events are marked with a gift box icon in the Event List.
Fill up your Event Card Collection to receive rewards, such as a Chaos Scroll of Goodness 50%.

I don't see any events marked with a gift box icon right now, though :f6: