I'd rather shore up their Fey nature. An affect that suggests that as fey creatures, they have influence over minds.
Look at the Feyborn template. It has two powers (Besides the teleport):
Undeniable Beauty (Immediate Interrupt, when targeted in melee, AW): Vs. Will; attacker must target another creature or end the attack.
Lure of the Wild (Standard, Recharge) Range 10, vs. Will; pull 5 and daze (save ends).
Tossing out a status effect (especially dazed, especially a save-ends effect) is too powerful for a racial. However, it is very much a controller trick.
Now, Eladrin make great wizards. Which might be that Eladrin are natural controllers. Some races make them better strikers (Elven Accuracy, Infernal Wrath), or Controller (Dragonborn). Let's go with that, but have an overtly 'Fey' influence. The first is taking the template of the DB breath. The third stands out, but I think is fairly balanced.
Luring Glamour Standard, Encounter. Ranged 10; Int +2/Charisma +2/Wis +2 vs. Will; 1d6+Cha psychic damage, pull 3.
Deceptive Terrain Minor, Encounter (Keyword: Illusion). Close Burst 1; area is difficult terrain until the end of your next turn. You ignore the effect in terms of movement. (Alternatively, could do it as Burst 1 within 10, but then the power would need to be a Standard action).