Final Fantasy II/Black magic

Very similar to the white "Teleport" spell, it teleports the characters one floor back in the dungeon. Otherwise, in battle it can also instantly defeat the enemies.

Support spells

Support spells are battle spells that target the allies. All these three spells increase the attack of the allies, and their effects stack up.

Berserk

"Berserk" directly increases the strength of an ally's attack. It stacks with itself, but subsequent casting become harder to perform.

Yoichi's Bow can be used as an item to case Berserk, at-will.

Aura

"Aura" adds additional damage the ally's weapon attack based on creature type. They are cumulative, but doesn't stack with repeated castings.

The spell works based on a series of successes, providing bonuses to Magic beasts, Aquatic creatures, Earth creatures, Giants, Spellcasters, Dragons, Werebeasts, and Undead. However, the NES version has a bug that prevents the bonus against undead.

Haste

"Haste" increases the accuracy and the number of hits. Repeated castings of the spell stacks, but become harder to apply with each repeated casting.

Masamune's sword can be used as an item to cast haste, at-will.

Debuff spells

Debuff spells are battle spells that target the enemies, but deal no damage.

Blind

The enemy's accuracy is greatly reduced. The Dark Bow inflicts the Blind status on the enemies it attacks.

Curse

The enemy's attack and defense are greatly reduced. The Ancient sword inflicts the Curse status on the enemies it attacks.

Stun (8000 Gil)
Stop (8000 Gil)
Sleep (8000 Gil)

Three similar spells, they all prevent the enemy from acting for a few turns. It seems logic to assume that the difference is in the element, but this is not confirmed. The Sleep sword inflicts the Sleep status on the enemies it attacks.

Confuse

The enemies will attack each other. This is the most difficult spell to get, because it is only dropped occasionally after defeating some giants in a secret room in the last dungeon.

Osmose

It takes MP away from the enemies and give them to the caster, thus replenishing the caster's MP. The character who uses this spell will never run out of MP, and will be free to raise every spell to the maximum. The effect is reversed if used against undead enemies.

Attack spells

Attack spells are battle spells that deal damage to the enemies or instantly defeat them. They are generally the favorite spells of beginners, but they lack variety: they just defeat enemies, as normal physical attacks do.

Blizzard (element: ice)
Fire (element: fire, of course)
Thunder (element: lightning)

The three basic elemental spells, thay can all be purchased in the starting town, Altair. "Blizzard" is probably the one that is less often made available during the game. "Fire" can be found in the dungeon of the second mission, so you don't have to buy it in Altair, the first town. "Thunder" is the most common one, in fact not only Leila starts already equipped with it, but also two weapons can cast it unlimited times without using MP: the Mage's staff and the Thunder spear.

Scourge (element: poison)

This spell can occasionally inflict either the "poison" or the "venom" status, that deal extra damage at the beginning of every turn. This spell can be cast for free by the Wizard's staff, that is anyway found late in the game.

Death (10000 Gil; element: death)
Break (10000 Gil; element: ?)
Toad (10000 Gil; element: ?)

Three instant-defeat spells. "Death" instantly kills the enemies, "Break" turns them into stone and "Toad" transforms them into toads, forcing them to leave battle. The result is the same, anyway. Since their price is the same too, it seems logic to assume that the difference is in the element, but this is not confirmed. As a final note, if Toad is raised to level 16 a secret is unlocked.

Drain (element: death)

Not only it deals damage, it also replenishes the caster's HP. The effect is reversed if used against undead enemies, who absorb the Death element. The Blood sword drains health points from the enemies it attacks.

Flare

A non-elemental attack spell, it inflicts full damage to any enemy.

Summary table

Very few black spells can be bought in shops, but every one can be sold; selling price is half of purchasing price. Spells that can only be found have their value cell highlighted in gray, and the number reported is twice the selling price. Of course, the value of a spell is related to its importance and usefulness.

Locations:

Magic shops: few black spells can be bought in shops, and most of these can anyway be found for free in dungeon chests or dropped by defeated enemies;
Chests: black spells that can be obtained for free are highlighted in green;
Leila: she starts with one black spell already equipped;
Win from enemies: many enemies randomly drop spells upon defeat; there is one black spell that can only be obtained this way, and it is highlighted in red.

Some weapons cast a black spell if selected from the "Menu" item in battle, others (marked with a star*) cause a status ailment when attacking an enemy. The effectiveness of the cast spell depends on the user's Intelligence, while the frequency of the inflicted ailment depends on the user's weapon skill level.

Spell	Value	Type	Effect	Location	Items
Warp	1000	Field/attack	Teleports one floor back OR instantly defeats enemies	Buy: Salamand	-
Berserk	10000	Support	Increases srength	Buy: Jade passage	Yoichi's Bow
Haste	20000	Support	Increases number of hits	Buy: Jade passage	Masamune sword
Aura	15000	Support	Adds damage to attack based on creature	Find: Fynn castle	-
Blind	4000	Debuff	Inflicts "blind" status	Find: Tropical island	Dark Bow (*)
Curse	8000	Debuff	Inflicts "curse" status	Find: Deist castle	Ancient sword (*)
Stun	8000	Debuff	Inflicts "paralysis" status	Find: Deist castle	-
Stop	8000	Debuff	Inflicts "paralysis" status	Find: Deist castle	-
Sleep	8000	Debuff	Inflicts "sleep" status	Find: Tropical island	Sleep sword (*)
Confuse	10000	Debuff	Inflicts "confused" status	Win: Pandaemonium	-
Osmose	15000	Debuff	Drains MP	Find: Mysidian cave	-
Thunder	150	Attack	Element: lightning	Start: Leila, Buy: Altair	Thunder spear, Mage's staff
Blizzard	150	Attack	Element: ice	Buy: Altair, Find: Snow cave	-
Fire	150	Attack	Element: fire	Find: Semitt falls, Buy: Altair	-
Scourge	2000	Attack	Element: poison	Find: Tropical island	Wizard's staff
Toad	10000	Attack	Instant defeat; secret at Lv.16	Find: Fynn castle	-
Break	10000	Attack	Instant defeat	Find: Fynn castle	-
Death	10000	Attack	Instant defeat	Find: Fynn castle, Buy: Jade passage	-
Drain	15000	Attack	Drains HP	Find: Mysidian cave	Blood sword (*)
Flare	40000	Attack	Non-elemental	Find: Mysidian tower, Buy: Jade passage	-