Lately I've been racking my brains trying to figure out what the bahrag are guarding in there caverns and these the theories I came with:

Here guarding a large stockpile of krana's.

There guarding some sort of thing that makes krana.

There guarding the protodermis.

I''m really not sure about any of them but if any sort of idea of what there guarding then tell us.

I think they are guarding protodermis becuse thats what hapened after Toa defeet Bahrag...

they are not gaurding protodermis the mine them in onu-koro!
they gaurd the krana!

Yah theirs protodermis in Onu-koro to.  But maybe there guarding sometning we don't even know about yet.

They are guarding the next evil bad guy plan. We will see all the secrets revealed in The Mask of Light... if we can wait that long...

Maybe they are guarding (the still recovering) Makuta!

GaliGee is probaly right there defending a recovering makutu

I think it's possible they're guarding the liquid protodermis, because it says that they use it for money in onu-koro, and you can't trade liquid, also how come you don't see super matorans all over? Although I also agree that they are some how guarding the next big evil bad guy plan. 'cuase what's a game without evil? And they simply can't just discontineu bionicle, it's too big. However for the sake of ruling the bohrok they might also be guarding krana so I think all three could co-exist.    

we dont know DUH!!!

Maby there guarding the so called mask of light!

Maybe they are guarding a special kind of photodermis that they use to make the krana!