Targetable
A unit is targetable by another unit if it is in The fallback content to display on prerendering and The fallback content to display on prerendering of the unit that would target it and does not have an effect that prevents it from being targeted. An adventurer's range is limited by their current The fallback content to display on prerendering. An enemy's range is limited by its range stat. Some abilities can apply effects to targetable units outside of an engage action or allow a unit to target allies. Some abilities can also deal damage to units without targeting those units.
FAQ
Do abilities that affects "targetable units" become your target?
If an ability affects "targetable units" those units do not become your target.
Source