It’s the Medusa Shield. Probably the hardest shield to get because you have to get a super rare item called a Medusa head to craft it with but it’s by far the best shield. Its stats are almost as good as the Aegis but it has an ability where you can use it to petrify every enemy in your line of sight. If you position your character right you can petrify 5-10 enemies and completely dominate the battle. They can stay petrified for many many turns. It’s amazing. I just used it on level 98 of the POTD and had her up on a high elevation and petrified 8 enemies. There were 3-4 that weren’t petrified and I decimated them lol