Stalwart Shell

Description
''Builds resilience. When recovering from damage, the bearer will remain invulnerable for longer.''

Makes it easier to escape from dangerous situations.

How to Acquire
Bought from Sly in Dirtmouth for 200.

Usefulness
This item primarily shines in some boss battles, especially ones where you may find it difficult to avoid hits. The longer invulnerability time can either provide a window to attack a boss with impunity (potentially overwhelming them with sheer damage before they overwhelm you, especially in combination with Quick Slash and Fragile Strength) or a window to focus soul and heal (when used with Quick Focus).

It is also useful in the Trial of the Fool, which features many encounters with boss-like enemies whose attacks are hard to dodge.