The Shattered Sun is a craftable post-Moon Lord non-consumable dagger that is an upgrade to the Radiant Star. It shoots a projectile that is affected by gravity and cannot pass through walls. Shortly after it is thrown, it splits into 2 copies of itself which shortly after split into 4 copies of itself. Upon hitting a tile or enemy, it creates an explosion that inflicts Holy Flames.
Its best modifier is Unreal.
The Shattered Sun's projecitles splitting, homing, and inflicting the Holy Flames
debuff. Note how after splitting, the projectiles create an explosion that also inflicts Holy Flames.