The elevator is manually operated so Cooper Mantly stays behind as the "winch man" while the rest of the party advances to next floor, which is inhabited by undead of all sorts. Predominantly skeletons with various gems socketed in their eyes that are then used to open puzzle doors.
Around half-way through a heavy slab falls behind the team, blocking any option of escape so they simply push through the undead, finding stairs up to level three which features really long and empty corridors, for good reason too. Half of them are illusions!
Saving throw: success!
Finally the party finds a laboratory where another wizard is assembling... gnolls? So that's what the dogs were for. Without hesitation the team enters combat against the dog-men and the magician, with Dalian charging straight for the spell caster only to make a horrible discovery.
Dog men sure look like gnolls to me.
The heptagram the mage is standing in shields him from all melee. Also, he's not so much a mage - he's a TURRET with unending magic! In just three rounds Dalian gets blown into pieces and the rest of the team, without a single ranged weapon or ability, are forced to retreat.
Badly injured and ill equipped for this fight, there is no option but to return to town - using the only exits available from the tower: they jump out the illusionary halls and land painfully back in the garden.