Penumbra

The Penumbra is a craftable post-Moon Lord rogue bomb. It fires shadow bombs that charge in the direction of the player's cursor and explode into homing souls.

Performing a stealth strike with the Penumbra will cause a shadow bomb to appear at the location of the cursor, quickly exploding into many homing souls.

Trivia

 * The Penumbra could be considered a counterpart to the Hypothermia due to their similar recipes.
 * The penumbra is the lighter region of a shadow cast by an object.