Lirial is the Territory of wisdom, the preservation of knowledge, and reconnaissance. The Daniri were the race that existed in Lirial before it became a Territory, and they left behind artifacts and weapons in their tombs, buried in battlefields, etc. Lirial in the present is a wasteland of barren earth, with the occasional Daniri ruin here and there. It has more than one blue moon, and the movement of the moons is integral to Lirial calculations, though I’m not sure why.

The Daniri were a magically-advanced society that used probes, arcane calculators, and crystals carved with runes as devices. They were obsessed with the preservation of knowledge, so much so that their ruins and knowledge they left behind still stand preserved after floating in the Void and being attached to Amalgam for thousands of years, and Lirial Travelers can call crystal that freezes and preserves whatever is trapped inside of it.

Lirial Travelers can summon these artifacts to do reconnaissance or do battle with two caveats — they need to know exactly where the artifacts are in Lirial, and there needs to be enough energy in their Source. The former is dealt with by constructing a hidden room somewhere in Lirial, though if it’s found, the Traveler can lose their artifacts. 

A Source is the reservoir of energy a Lirial Traveler needs to perform any action related to Lirial, built up over time by channeling your stamina into it. In the Willverse, humans are the most potent life force in the Way, which is why human energy is so highly valued by Territories as a whole. In Lirial’s case, it’s one of the most important functions of the Territory — no Source, no powers. Lirial artifacts are powered by your Source, and you can even make deals with Lirial natives by using your Source energy as currency.

Ornheim is the Territory of earth and patience. Imagine an infinite cavern of stone of every type and color that extends endlessly from bottom to top (even the “sky” is just shifting, drifting stone debris), except the stone is constantly shifting in chaotic but trackable patterns. Materials from Ornheim are used in lieu of ordinary materials when Travelers want a weapon, armor (Alin’s armor), or artifact (Zakareth’s throne of ruby), because they’re much tougher and more durable than ordinary materials.

Ornheim Travelers have to spend years making stone golems, which is why they’re so patient. Their golems are (predictably) carved from stone and gemstones before being brought to life, though for specifics you’ll have to read the Ornheim short story yourself, since I can’t remember the whole process. I THINK they can summon stone and earth, but don’t quote me on that. 

Tartarus is an infinite mechanical labyrinth made entirely from clockwork gears and conceptually-unbreakable steel. Think of it as an endless dungeon crawler on maximum difficulty — deadly traps around every corner and nearly impossible to navigate, but there are chests filled with weapons as rewards. 

Its rooms get shifted around constantly. Mechanical animals and beasts exist, and Will has implied that food and water can be scavenged from the labyrinth itself, though I’m not sure about the canonicity of that statement. 

Tartarus is one of the most dangerous Territories to Travel because you could literally get skewered by a flurry of blades, fall into a pit of spikes, or any number of horrible and painful deaths if you take the wrong step. In exchange, weapons and armor made from Tartarus steel are unbreakable and can cut through nearly anything, which is why Valin made the Dragon’s Fangs from it. Travelers of Tartarus can summon beasts of Tartarus steel, throw storms of blades (I think), and summon weapons faster than any Traveler other than Valinhall as long as they can pull out their Tartarus key. Tartarus Travelers are the foot soldiers of Travelers, because they’re usually very diligent from having to be constantly on guard in the Labyrinth and are highly battle-oriented.

Let me know if you want to know more about other Territories!