HCBailly plays Final Fantasy IV (Super Famicom) - Part 64 of 70

If you thought that was it with the boss-style enemies, think again.

Subterranean Valley Map (by FlyingArmor)

Near the end of the cave part of this area, there is an invisible bridge to the west that you have to cross in order to get anywhere.

You'll then see a warp tile. Once you do, the path will be very straightforward and will also lead to a chest that contains another Defense Ring that you'll want to give to Rosa.

After the save point, you'll have another boss to contend with when you find another sword. You'll face the Dark Bahamut, who will cast Mega Flare before you can even cast Reflect. Cast Reflect as quickly as possible, and have Rydia summon Ashura and Sylph with the hope of healing everybody. Have Rosa cast Cure 4 on everyone, just in case. Have Kain attack with Jump and have Cecil and Edge attack with swords after using a Bacchus' Wine or a Berserk spell on them. You'll get Ragnarok for winning this battle, and it is Cecil's most powerful weapon. It also increases his Vitality by 15.

The Minerva Jumpsuit prevents the Paralyze ailment and increase Strength, Agility and Vitality by 15, but decreases Wisdom and Will by 15.

To beat Plague. equip Kain with the Gunge Lance, Rosa with the Sage Staff and Edge with the Full Moon. Plague will cast Death Sentence at the start of the battle. Kain and Edge will use regular attacks. Have Rydia summon Bahamut to cast Mega Flare, and have Rosa cast Holy. You'll win the battle and get the Holy Lance.