If an Action deals Damage multiple times, can it benefit from Badlands each time?
Only if one time is to Invaders and the other time is to Dahan – a single Badlands token can't increase Damage more than once against a given piece type in a single action. Most of the time, it doesn't matter which instance of Damage is increased by a given Badlands, even if a single action damages Invaders more than once.