Since Halo Infinite is an open world, or semi open world. I would love to find secret caves that we can go into. As we progress through these caves we will find dead ancient humans, and writings. The atmosphere starts to change into something unexpected, something Flood related or Promethean related, where there are giant secret bosses, like a huge Promethean snake, or huge knight. For the flood, it would be hordes of flood coming at you all at once. When you take them all out a giant flood form will appear. Or even better Ancient Forerunners who are protecting something important. the rewards would be either emblems, achievements, and or currency/credits to the Halo Infinite store.
I know this might be unrealistic but just a thought.
Any ideas you guys have? 
Obviously it would be more of an easter egg than anything but it would be a hilarious secret boss.
It would also be really cool to battle a Sharquoi and Flood Juggernaut as more serious bosses, perhaps even some unique and dangerous wildlife native to Zeta Halo like the Guta in Reach.
Sounds like a fun idea! What also could be cool if when it’s nighttime the flood will get more agressive and new forms
will come out.
Would be a nice addition, adds to the depth of exploring which has been marketed throughout Halo Infinite, bonus if it plays into the story or gives some type of lore.
> 2533274810177460;2:
> Pluton.
> Obviously it would be more of an easter egg than anything but it would be a hilarious secret boss.
>
> It would also be really cool to battle a Sharquoi and Flood Juggernaut as more serious bosses, perhaps even some unique and dangerous wildlife native to Zeta Halo like the Guta in Reach.
Link is broken for me, but some flood bosses would be cool at the library or something.
> 2533274832674094;5:
> > 2533274810177460;2:
> > Pluton.
> > Obviously it would be more of an easter egg than anything but it would be a hilarious secret boss.
> >
> > It would also be really cool to battle a Sharquoi and Flood Juggernaut as more serious bosses, perhaps even some unique and dangerous wildlife native to Zeta Halo like the Guta in Reach.
>
> Link is broken for me, but some flood bosses would be cool at the library or something.
OK I’m calling it:
Halo Infinite 50G Achievement: Find & Complete 7 secret Warden Eternal boss battles.
> 2533274810177460;6:
> > 2533274832674094;5:
> > > 2533274810177460;2:
> > > Pluton.
> > > Obviously it would be more of an easter egg than anything but it would be a hilarious secret boss.
> > >
> > > It would also be really cool to battle a Sharquoi and Flood Juggernaut as more serious bosses, perhaps even some unique and dangerous wildlife native to Zeta Halo like the Guta in Reach.
> >
> > Link is broken for me, but some flood bosses would be cool at the library or something.
>
> https://www.halopedia.org/Pluton
LOL This thing was Bonnie Ross’s Twitter profile picture for a long time.
> 2592250499807011;7:
> OK I’m calling it:
>
> Halo Infinite 50G Achievement: Find & Complete 7 secret Warden Eternal boss battles.
I really REALLY don’t want to fight Warden Eternal AGAIN especially in a Halo title supposively lasting for the next 10 years.
I know your post is just what if but where would another forerunner come from? As for a secret boss, I would be awesome if we fight the forerunner equivalent to the Colossus.