My very non-serious Magnus Archive fear theory:

If your favorite fear is The Corruption then you’re extinction coded.

If your favorite fear is The Dark then you’re end coded.

If your favorite fear is The Eye then you’re spiral coded.

If your favorite fear is The Desolation then you’re slaughter coded.

If your favorite fear is The Lonely then you’re stranger coded.

If your favorite fear is The Slaughter then you’re the dark coded.

If your favorite fear is The Web then you’re buried coded.

If your favorite fear is The Spiral then you’re hunt coded.

If your favorite fear is The Stranger then you’re vast coded.

If your favorite fear is The Hunt then you’re flesh coded.

If your favorite fear is The Vast then you’re desolation coded.

If your favorite fear is The Flesh then you’re lonely coded.

If your favorite fear is The End then you’re eye coded.

If your favorite fear is The Extinction then you’re web coded.

If your favorite fear is The Buried then you’re corruption coded.

This theory is based on nothing other than anecdotal evidence provided by my friends.