Fifth Shrine and last Glowing Orb

[h111]

There's a fifth shrine in the game as mentioned by the stone faces but it's very hard to find

I've found the 4 elemental orbs and can enter the last castle, but I read that there is a secret boss/area if create the Orb of Balance, the last one

I'm also missing the last glowing orb in order to make the Orb of Balance. Is there a glowing orb in the last castle? All my maps are 99% cleared except for the castle

[minmay]

Full solution:

SpoilerShow

One of the clues tells you that it was not the most powerful spell, but the most balanced spell, that revealed the shrine. Another clue told you that it was in the place where the four elements are most balanced.
Stand in the middle of the four statues in front of Castle Nex, where you placed the other 4 orbs. Then cast a spell with just the balance rune (center) selected. This will take you to the fifth shrine.

Where your last power gem probably is:

SpoilerShow

You get it for defeating the "final" boss in Castle Nex.

[Freestylae]

How'd you get into the castle?

I have the four orbs placed, yet the hooded Mage only peers through the slit in the door then closes it. Nothing happens.

[Dr.Disaster]

Wrong placement maybe?

[Freestylae]

Allrighty well I got what I assume to be the "Bad Ending." Anyone can let me know where the last alter is? Thanks!

[minmay]

Where to put the Balance Orb:

SpoilerShow

After defeating the Lindworm, go back to the Hub and a door that was previously closed should be open. The statue for the Balance Orb is in plain sight in the room past that door.

[eLPuSHeR]

I have defeated LIndworm and got the "bad" ending but I am missing two glowing orbs. I think I was unable to get some of them (crystal mines comes to mind).