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Pretty much all Arcane Magicks are of the Dark element. Holy Enemies beware! However, there are a few non-dark element spells here, and they're useful for pretty much all of the game.

Spell	MP	Price	Effect	Obtained
Beserk	10	1000	Dramatically increases the target's speed and strength for a period, however controlling the character is not possible	Rabanastre, after Leviathan
Dark	10	500	Deal moderate dark damage to all targets in range	Rabanastre, after Barheim
Gravity	30	2800	Reduce HP of the target by 1/4 of target's max HP	Rabanastre, after Belias
Confuse	10	1400	Cause one foe to confuse friend with foe	Raithwall, Dyce, Demon Wall
Drain	40	3200	Transfer HP from the target to the user	Eruyt
Decoy	10	2500	Inflicts the status effect Lure on the target	Eruyt
Syphon	2	4000	Transfer MP from the target to the user	flight Rabanastre - Bhujerba
Vanish	24	4900	Render one ally invisible	Rabanastre, after Judge B.
Darkra	20	5800	Deal dark damage to all targets in range	Hunters' Camp, Phon
Death	30	5200	Reduces one target's HP to 0, doesn't work on the undead	Rabanastre, after Judge B.
Bubble	32	3300	Doubles max HP of one ally	Muthru Bazaar, defeat 12 marks
Reverse	50	7600	Causes healing and damage to have opposite effect on target	Muthru Bazaar, defeat 10 marks
Vanishga	60	8700	Render all allies in range invisible	Rabanastre, after Judge B.
Graviga	36	6800	Reduce HP of one target by 1/2 of target's max HP	Archades
Darkga	30	9400	Deal heavy dark damage to all foes in range.	Balfonheim, get Treaty-Blade