Can the rune master use ghost armor more then once during the same attack?

The card doesn't say "exhaust" and there is a fatigue cost, so it appears that as long as you have Stamina left …

It's similar to Jain's ability that lets you "dodge" some or all damage by spending fatigue.

The card state: "After you roll defense dice when attacked use this card to add 1 SHIELD to the result" it means you can only add 1 SHIELD to the that result.

The card does not exaust because you might be attacked again and roll for defense again.

If that happens, then you can use this card again to add 1 SHIELD to the result.

The text on the card suggest you can use it only once, unlike Jain´s habilities which explicitly say you can use it on one or all.