Creatures, both summoned and conjured

After filling the lantern and reading the words of opening the group enters the easternmost door and spends time investigating an old library – and the undead that inhabit it, They slay the undead and journey on to find a bust that gives the power of tongues. Passages are investigated and the group encounters an extraplanar being, While battling the creature, the group enters a cavern of intergalactic entrails that spit forth bloodthirsty raptorsauruses. Raptorsaurii?
Finally, the paladin’s powers become relevant and she dispatches the beasts after a pitched battle while the mages and cleric seal the rift (at least temporarily) with spells. More though produces headaches. Where are the circular vaults? Whats with all the sages and such? Where is the rod of ruling or whatnot? The group returns to the central chamber and prepares to turn the statue to open another of the secret doors..