What do I do if one of my units has two units with the talent Engage within its range?

Are Gateport landmarks considered path hexes for the purposes of connection to possible marks?

Can spires attack landmark minions?

Can you Overload an occupied Gateport?

Do I get to level up with a hero that removes the last health off the Altar of Aggression?

Do I have to reveal an Unstable Rift when I explore it?