Wall Face has two variants: Wall Face and Doom's Wall.
The party should be well-equipped already from the last couple of bosses: if not, get all the best gear from Dwarf Village and hone all weapons and skills to Level 2. It may help to stock a couple Faerie Walnuts at this point; unless the party has just leveled up, they might be short of MP from downing all those Tomato Men that came before. The party's average level should be 12 or better.
Wall Face won't move until both of its Chamber Eyes are downed, but it can still pelt the party with its water magic, namely Freeze and Energy Absorb Level 3. It can also use the wood spell Revivifier to prolong the fight. The quickest and easiest way out in modern versions is to set a shortcut to one of Gnome's spells for Popoi and chain as fast as possible on the center eye. Have Primm heal as needed while Randi attacks. If it moves, the player will have about 15 seconds to finish the fight before getting crushed, so it is best to avoid making it move at all.
- HP: 1180
- MP: 99
- DEF: 29
- EXP: 4750
- GP: 648
- Weapon Orb: Whip
- Weakness: Lumina
- Location: Northtown Ruins
Have your party at or above level 30 for this fight, and make sure every spell you have is at level 4, especially Cure Water, and Popoi's spells. All weapons should be upgraded and practiced with until they reach level 4 as well...although if you'd like, once you get the Bow and Spear and Sword orbs located in the ruins, have Watts forge them to level 5, and work with them until they reach level 5 for the extra damage. Make sure you have all the best armor from Northtown as well.
Doom's Wall is similar to Wall Face, only beefier, and with more powerful spells, say level 5. That is nothing compared to what you faced back in the Fire Palace. Doom's Wall likes to toss Thunderbolts at you, so keep your HP up using Primm's level 4 Cure Water spell. This boss is actually weak against light magic, but you have none, so you'll have to attack it with spells of a different element. It doesn't matter which one, as Doom's Wall will take normal damage from all of them. If Doom's Wall is alone, it'll start causing Cave-Ins, which can do some damage.