Myrmidia

A goddess in Warhammer Fantasy worshiped by the men of Tilea and Estalia, as well as the Empire in a reduced capacity. She's an outright knockoff of Athena, being a goddess of strategy and the chain of command. Her followers are usually rivals of the main gods of the setting (Ulric and Sigmar respectively), who are mainly about going on human WAAAGH!s against Chaos worshipers and the Undead. She is the daughter of Morr, the human god of the dead, and Verena, the goddess of justice and scholars. According to 4th edition Warhammer Fantasy Roleplay, a language 'Battle Tongue' used by human soldiers in, well, battle was created by Myridia herself. She has a number of knightly orders, but the most prominent is the Order of the Blazing Sun, which produces classically heavily-armored knights whose real claim to fame is being exemplars of her tenets that are some of the best tacticians/strategists around. Her sister is Shallya, goddess of mercy and healing. She apparently managed to survive the End Times and live on into the Age of Sigmar as there is mention of a gender-neutral knightly order ”the Order of the Ardent Star” that worshipped Myrmidia at their fortress on the Flamescar Plateau. Said knights rode into battle on giant murder lizards (who sadly did not breathe fire) and took pride in a banner with a star on it that supposedly was given to them during the Age of Myth by the goddess (hence their order’s name). Unfortunately, they were all but obliterated by a horde of Khornate warriors during the Age of Chaos with the exception of a single female knight who managed to escape with the banner into the mountains nearby.

In Warhammer 40k her closest equivalent is, or rather was, an obscure war goddess named Mythrus who was mentioned in one of the Siege of Terra books and who counted among her worshippers the grandson of one Ollanius Pius. Despite The Emperor having banned all religions and psuedo-religious systems (excluding his Imperial Truth and the Machine Cult) due to fear of them fueling the Chaos Gods Mythrus was apparently still being worshipped by secret groups in the Imperial Guard up till the Horus Heresy due to humans instinctively having a strong desire to look up to a higher power for guidance, something big E couldn't seem to comprehend despite his millennia of life. At the end of the heresy Horus got killed, The Emperor got put on life-support, and the Imperium of Man replaced the Imperial truth with worship of The Emperor as a god leaving no room for the cult of Mythrus which was wiped out.