Seriously. All of them.
Since this is basically "remember that spell from Dragon Age Origins" thread, how about we try to come up with new spells or at least abilities from non Dragon Age games.
Inverse: When used on the player it will invert the movement of camera and character and blurs the screen. This also slows down responsiveness of actions. (On consoles this inverts the movements of the two analogue sticks). In addition (applies whether the afflicted is a player character/ally or enemy) inverse makes the afflicted's movements staggered with a chance of completely falling over. Inverse also reduces rate of evasion, accuracy, speed and damage of attack and rules out chances of landing critical hits. Targets with low resistance to Inverse will pass out, whereas targets with high resistance will suffer small penalties. However no one is immune to this spell.
Darkness: Reduces the accuracy of the afflicted target. No target is immune to this affect. In extreme cases this reduces the accuracy to 0%, whilst foes with high resistance will only suffer a 10% accuracy penalty and half the duration time. Targets with low resistance will panic and are more likely to attack allies.
Intense Aggro: Some enemy tanks can taunt player character and party to the extent that only that tank will be visible to the party. This is to replicate the aggro manipulating mechanics that players can use on foes. This means that if a tank aggros your party, you'll be vulnerable to other enemies catching you off guard. The only remedy to this status affect is to kill off the tank as quickly as possible as the duration is permanent. (This is not a spell. It is an ability that tanky warriors already have in their arsenal).
Cascade: Much like Bad Breath ability from the Final Fantasy series, Cascade is a lingering cloud of negative affects. There is a guaranteed chance that at least one of the negative affects will be inflicted on any foe who is caught within the cloud. Player and allies should be careful not to enter the cloud.
Bloom: This is the opposite of Cascade. Instead of being a cloud of multiple negative affects, this randomly cloud adds positive affects to anyone who enters the cloud. However enemies can make use of this cloud too.
Primal Rage: A risky spell that angers enemies to deal more damage with their attacks but renders foes unable to use their talents and spells. Primal Rage is particularly useful against casters who have weak physical attacks but risky against warriors and rogues. Foes with low resistance to this spell will flail around reducing their accuracy and increasing the chance of critical hits being inflicted upon them (if you leave yourself open that tends to happen).
Aura of Weakness: This spell not only highlights an enemy weakness, it actually increases a foes weakness. So if a foe already takes more damage against fire elemental attacks, they will take even more damage from that attack. The only foes who are immune to this spell are those who have no weaknesses to exploit in the first place.
Aura of Strength: This spell highlights any resistances within the party and amplifies them. So for example, if an ally has a 30% resistance against melee attacks, this will be increased to 45% resistance to melee attacks.
YELL FOR HELP!: The mage yells as hard as they can, but they use magic to further amplify the yell. This causes an earthquake that affects everyone friend and foe alike. Whilst the spell deals no damage, it prevents all affected from doing anything as long as the spell animation is active (duration 3 seconds). During the duration the mage will restore some health to entire party and remove all negative effects (hence "HELP" in the spell's name). This has a long cooldown and is only used as a panic button.