Here is the explanation for sledge

At the Street Runner level, Ash has 10 Shadow Amp points to spend on Sledge. She wants Sledge to have some gleaming chrome on him, so she starts with a cyberarm, which costs 1 point. She wants to be able to reroll two dice on Close Combat attacks, so she adds that ability, which costs two points. The cyberarm as a whole costs 3 Amp points and 1 Essence.

Next she adds some cyberspurs. The effect she wants is to allow Sledge to do either Physical or Stun damage in unarmed attacks. This Amp costs 2 points and 1 Essence.

Now she turns to the eyes. She selects a single effect for the eyes—the ability to ignore vision modifiers. This costs 2 points, and once again, she loses a point of Essence.

Finally, Ash is well aware that speed kills, so she needs something like wired reflexes. Or something that is wired reflexes. She gets it at the second level to get +1 attack and +1 Plot Point. Again, the price is 3 Amp points, and the powerful nature of speed enhancements means Sledge loses another 2 Essence.

Altogether, Sledge has spent all 10 Amp points and has lost 5 points of Essence, making his Essence 1. He would have trouble casting magic, but Ash wasn’t planning on having him do that anyway. The loss of dice on healing tests might make make life difficult for Sledge, but Ash figures she’ll deal with it by making sure Sledge takes out opponents before they hurt him too much.