Explain/Wiki Camp 2 Challenge Crystals
In Universe Explanation
Wiki Camp 2 Challenge Crystals can be found scattered around various pages in The Wiki Camp 2, including this very page!
Usually finding a Challenge Crystal requires finding a blue link to the page containing the Crystal or doing some Challenge.
All of them are required to be collected to unlock The End.
Watch out for the Thanos.
Meta Explanation
They appear to be a reference to games like Kirby 64, where you need to get all crystal shards to get the true ending, or games like Mario 64 where you need to collect a certain number of stars to get to the next level, which in this analogy, is The End. For a more succinct term, see MacGuffin.
There are currently 61 challenge crystals scattered across the wiki. Some speedrunners have attempted to get them all in minimal possible time.
There are also currently 9 other hidden thingies... ew...
Also, despite their name, they are currently not related to any Challenges.
Want a hint? It's yours my friend.