Stalwart
This The fallback content to display on prerendering The fallback content to display on prerendering lose more than 1 HP in a single The fallback content to display on prerendering.
FAQ
How does Stalwart work?
If a unit can't lose HP, for example by having the enemy skill Stalwart, nothing can cause it to lose HP. This includes true damage. This isn't damage prevention like defense is, so no type of damage can override this. Only skills/abilities that would straight up The fallback content to display on prerendering the unit outright can get around this (or the The fallback content to display on prerendering status effect, which would then allow you to ignore the skill entirely).
Source