Swordmage

Genasi Swordmage

Swordmages are mages with swords. Basically, take a kid who realized he wanted to be a fighter when he grew up, then learned he was too weak to properly kill a monster with his sword. So he lit his sword on fire or strapped a car battery to it, and now boom! He's in business.

Dungeons & Dragons: Fourth Edition

Introduced in the Forgotten Realms Player's Guide, this is the first (and only) Arcane Defender using pre-Essentials design principles. This class probably originated from Eladrin, which is weird since Eladrins aren't necessarily the best race for Swordmages compared to, say, a Githyanki, but then again who cares, Githyanki don't even have feat support like a core race. That said, Swordmages decided that since they're good at magic but not really that strong, they'd just cast spells and inscribe runes onto their sword and use it to stab foes like a magical syringe full of TNT. Their class features allow them to benefit from using a one-handed sword without a shield to marginally make up for their lack of shield and heavy armor proficiency. They also have potent feature powers for marking enemies, so that if they attack the Swordmage's allies, he can cushion the damage with magic shields or teleport the ally/enemy away.

Unfortunately for Swordmages, their third class feature doesn't actually confer a significant benefit in combat - Swordbond, which allows them to pick a weapon with which to bond. They can rebuild the sword if it is broken with magic, or they can summon it to their hand if it is within a certain distance (which is reasonably far.) No powers of theirs really take advantage of this (unless somehow their thrown sword power is botched and they need to get their weapon back pronto) but it can be useful if you find yourself disarmed in some lame gladiator/prison scene. It can also turn up profit: simply sell your sword, then when safely in possession of the coin and away from the merchant, summon it back into your hand. This is a great way to convince a DM to kill you, though. Another thing you could do, is use your sword as a trap. Hide it in a bush, put your target between you and the bush, then summon your sword to your 'hand' impaling the guy in between you and the sword.

Swordmages have a number of Paragon Paths outside of those found in the Forgotten Realms documentation, such as the ones in Arcane Power as well as one or two tucked away in the Manual of the Planes. Most Swordmages take the "Intelligent Blademaster" feat, which allows them to use their Intelligence modifier for melee basic attacks and opportunity attacks, instead of their strength.