Arctangent Bow

 is a bow.

Obtaining

 * Crafted by a Bow Carver (Lv. 100) from
 * 41 Steam Crackler Heart
 * 30 Atomystique Stone
 * 20 Mofette Stone
 * 11 Obsidemon Slag
 * 5 Steam Crackler Egg
 * 4 Atomystique Tephra
 * 4 Solfatra Ulna
 * 1 Obsidemon Vertebrae