The FlameDogs you may remember from the Tower of Zot return in force here, and are probably the most dangerous normal enemy you'll fight. However, the guardians of the Ice Weapons are nasty as well, especially the Chimera.
Both chests are guarded by Alerts. Attacking an Alert (without killing it) will result in it summoning a creature to its side. If you kill the creature, the Alert will summon another the next time you attack it, so it's best to finish it off first. However, Chimeras have a nasty Blaze attack, and absorb the three main Elements, so they are a pain to fight. If Rydia has Bio, it is quite effective against them. The Stoneman is much less threatening—it has a ton of HP but is weak to Ice.
Both chests are guarded by Alerts. Attacking an Alert (without killing it) will result in it summoning a creature to its side. If you kill the creature, the Alert will summon another the next time you attack it, so it's best to finish it off first. However, Chimeras have a nasty Blaze attack, and absorb the three main Elements, so they are a pain to fight. If Rydia has Bio, it is quite effective against them. The Stoneman is much less threatening—it has a ton of HP but is weak to Ice.