Below I've qouted from the original class chronicles article on the original 3.5e War Mage, removing the part that no longer applies, to help add flavour to the subclass for people.
"To some of the cultures of Faerûn, the ability to destroy in a variety of ways is (or was) too much to ignore. To other cultures, warmages serve as elite battlefield generals, espousing the old adage that the best defense is overwhelming offense.
The ancient Raumathari battlemages were some of the most fearsome examples of warmages in Faerûnian history. While many of the battlemages were wizards and sorcerers, a significant portion of was made up of warmages. The art of this forlorn empire may be mostly lost, but those few who still practice it are extremely dangerous. Raumathari battlemagic involves a mixture of both destructive arcane magic with swordplay, blending the two in terrifying destructive synergy. When the Bronze Battletower (UnE -- the home of the powerful Raumathari battlemage Vostas) was under siege, her lover, a warmage by the name of Welbohn Khuul, defended it to his last breath. It is believed that Welbohn's spirit was absorbed into the tower after his death, leaving the warmage to haunt the tower forever. Locals whisper that the current resident, a renegade Wychlaran by the name of Iaokhna Nuchlev (NE female Rashemi sorcerer 3/druid 3/durthan[UnE] 3), is being driven mad by Welbohn Khuul's spirit (CN Raumathari male human ghost swashbuckler 3/warmage 6/Raumathari battlemage 10). Khuul is trying to drive out the durthan in the hopes of bringing students back to the Bronze Battletower to study battlemagic. He can't drive her out himself, because she hides in a room that is shielded from him in his undead state.
While many Thayans look down on warmages as narrow-minded louts, they can't deny the usefulness of having a contingent of these casters in their armies. From the perspective of the Red Wizards, warmages make excellent subjects because they are powerful weapons but lack the magical protections to defend themselves against mental control. A band of politically neutral warmages has arisen in Thay in recent years under the leadership of Norano Reked (N Mulan male warmage 14). Calling itself Daarthos Koruna after a strange magical artifact the members discovered in the Sunrise Mountains, the band serves Thay as mercenaries for hire. The Daarthos Koruna are seven circlets that render their wearers undetectable by magical and psionic means. For the most part, the band clears out the ruins of the Sunrise Mountains and Delhumide, but they have been known to perform special missions for a number of zulkirs.
Warmagic traditions have developed among a number of other races and lands. A small number of warmages are found among the War Wizards of Cormyr, though the order generally looks askance at the narrow focus of these members. The Shoon Imperium kept an elite cadre of warmages known as the sihirbalak. Many members fled to the Heartlands and Inner Sea lands after the fall of the Shoon Empire in 450 DR. Among the sun, moon, star, and wild elves, warmages are uncommon but do exist. They were instrumental in a number of battles against demonic hoards before the fall of Myth Drannor.
Currently, several warmagic are academies scattered across Faerûn. A small academy, appropriately known as the School of Warmagic, has been open for the last three years in Halarahh, the capital city of Halruaa. Though boasting only 50 students, this academy doesn't have the negative reputation that warmage schools have in other parts of Faerûn. A small department at the Wizard College of Gheldaneth in Mulhorand teaches warmages, though only 75 are enrolled. Some of the other students in the college look down on the warmagic students, but the nation sees them as an important line of defense in its continued existence. Small private academies also exist in Waterdeep, Silverymoon, and Suzail."
