The shield has two functions: (1) to clear control effect debuff statuses and (2) to make it's wielder immune to control effect debuff statuses (stun, silence, chaos, disarm, void, fossilize, freeze, fury restriction and laceration).
The shield clears control debuffs only when first activated.
This only happens if it's your turn when the shield is activated. The icons will still remain if it's activated on your enemy's turn.
Immunity to Control Effects
For as long as the shield is active, it will make you immune to any debuffs that control your character's behavior.
The shield will still protect your character from control statuses that are already inside the shield.
If the shield breaks, you are vulnerable to control statuses again.
Shields have their own HP (before they break) although it's not visible. It's HP is determined by two factors: the shield growth rate and your partner's attack or HP (unconfirmed). The shield takes a percentage (growth rate) of one of these numbers. More testing is needed to confirm. The castor's attack seems possible to determine the shield's HP since Katen's shield claims to work by taking a percentage of its attack.
- Nozarashi Kenpachi's fossilize and silence go right through the shield and ignore the shield altogether