PSA: Just CC the dam rift herald
Sure the rift herald is annoying, but it can be killed in lane easily enough, especially if you just CC the thing. The only major problem I can see right now w/ the rift herald is that it is WAAAYYY to easy to solo. Anybody in the game can solo it. Maybe make it so you need 2, possibly even 3, people to take it. Also buffs to turrets wouldn't hurt.