Tamrkaar ability repairs the most damaged Shield in your cards. Also, it restores a damaged shield even if it is reduced to 0.

For e.g. if you have a card with a Shield of 2, and it is hit with a Physical/Ranged attack of 1. The Shield will be reduced to 1, and the card with Tamrkaar ability will repair your shield by +1 on its turn. In case, the Shield reduces to 0, the card with Tamrkaar ability restores the Shield to 1 again.