Spoilers: Game expedition and the trilogy's jackets. No campaign outcome.

The Order of Loremasters in the Southlands
Teclis is a Warhammer II lord. In Immortal Empires he starts in the Southlands, and an early dilemma can keep the Order there, send it back to the White Tower on Ulthuan, or try to hold both. Secrets of the White Tower spends Scrolls of Knowledge. The What's Next note for Update 7.0 describes that feature as a strengthening of wizards across his armies.
On the field he is the caster. Spearmen give him a screen. Lothern Sea Guard shoot and then receive a charge. Tyrion, on Eataine, is the melee twin. A Southlands war is the player's map. It is not a chapter of the novels.
Chrace, Lothern, and the mage of the pair
Blood of Aenarion is book 1 of William King's Tyrion and Teclis. The twins come from the wilds of Chrace, in the line of Aenarion, the first king of Ulthuan. Tyrion is the swordsman. Teclis's gift is magic, and the jacket calls him the greatest natural sorcerer of the age, a power it sets beside the fabled Caledor. It also says he was among those who first taught magic to men.
When Malekith learns the twins exist, they are taken to Lothern to learn war. The PDF adds a daemon banished by Aenarion and a Phoenix King's court. The ebook page names the Witch King. N'Kari enters in Sword of Caledor, when Malekith makes a pact with him.
Lustria, Finuval Plain, and a separate war
Sword of Caledor, book 2, sends Tyrion and Teclis into Lustria after Sunfang, the lost sword of Caledor Dragontamer. Dark elves attack Ulthuan, and the assassin Urian Poisonblade is sent against the Everqueen. Bane of Malekith, book 3, puts the twins on Finuval Plain against a host the jacket says Malekith himself leads. In Avelorn, Tyrion and the Everqueen are hunted by druchii. Teclis comes to his brother.
Publication order is the trilogy's own order: Blood, Sword, Bane. That is also the in-universe order of these three novels. The Curse of Khaine is a later End Times book. It calls Tyrion Regent of Ulthuan. Eataine and the Order of Loremasters do not open on that regency.
Teclis: gameplay and availability · More character stories
Sources
- High Elf army roster — totalwar.com
- Immortal Empires FAQ, February 2023 — totalwar.com
- Blood of Aenarion — blacklibrary.com
- Sword of Caledor — blacklibrary.com
- Bane of Malekith — blacklibrary.com
- Immortal Empires DLC Ownership Guide — SEGA — support.sega.com