The first time you fall below half Health each fight, Shield equal to 20% » 30% of your Max Health.

The first time you fall below half Health each fight, Shield equal to 2 » 3 » 4 times the Burn on your enemy.

The first time you use an item each fight, Shield equal to 10% » 15% » 20% » 25% of your Max Health.

The first time you fall below half Health each fight, use your highest Shield item.

The first time you fall below half Health each fight, Shield equal to 20% » 30% » 40% » 50% of your Max Health.

When you Burn with an item, Shield equal to 1 » 2 times that item's Burn.

The first time you use a Large item each fight, Shield equal to 10% » 20% » 30% of your Max Health.

When you Haste, Shield 10 » 20 » 30 » 40.

The first time you fall below half Health each fight, Shield equal to 2 » 3 » 4 times the Poison on your enemy.

When you use an item, Shield 20 » 40.