I think a battle defense would be cool.both teams could have a very tanky hydra in the very back of the map(it would be in a place that's not easily sniped too. The goal would be to kill the enemy's hydra to win. Teams would have to balance defending their hydra and pushing to slowly kill the enemy's. I think it'd be a fun objective to push in, killing enemy guardians as you strive to in their base, to get as much damage on the hydra before dying and then repeat.