Can Irelia Fervent's legend ability trigger during a showdown when En Garde targets her, allowing her to ready?

Ruling: Yes, Irelia's legend ability can trigger during a showdown when En Garde targets her. It is a triggered ability, not an activated ability, so targeting Irelia with En Garde will trigger both the unit and the Legend abilities.

Nuances:

• The key distinction is that triggered abilities (which respond to game events) can occur during showdowns, while activated abilities cannot be used during showdowns.