Bodyweight Variable-Chambered Heart Option

Bodyweight Variable-Chambered Heart Option is heart option allows doubles the amount of time the user can hold his breath (10-20 min.), and gives a + 1 to Endurance skill. The way heart option function work is same as crocodile's heart. Warning: Using the "Overdrive" function with the "Bypass" function will result in a stroke. Surgery: N (no addition to original surgery).