Ratchet Up (Blue)

If an item you control has been destroyed this turn, action cards get -1

while defending this.

Galvanize - When this defends, you may destroy an item you control. If you do, this gets +2

"Rest under the shade wrought by our wise Founders, that you may venture deeper into the great Unknown." - Professor Min

If an item is destroyed after this has been defended, the defending action cards will retroactively get -1.
The -1 applies until the combat chain is completely closed. If a defending action equipment has Temper and its is reduced to 0 (with this effect applied), it will be destroyed when the combat chain closes.
This triggers when this becomes a defending card on the combat chain. When the triggered effect resolves, you choose whether to destroy an item you control.