Nerves of Steel is a M Guardian Action - Aura card from Flesh and Blood (Everfest, EVR).
M
Everfest (EVR)
Card Text
When Nerves of Steel enters the arena, remove a -1{d} counter from a chest equipment you control.
Battleworn and temper on equipment you control doesn't trigger if it defends an attack with 2 or less {p}.
When your hero is dealt damage, destroy Nerves of Steel.