"Oh, there's one obvious thing there, but it really loses the effect if you can't see the artifact itself... How about instead - oh, just to clarify, this would be an illusion and it'll expire eventually unless you can find someone to feed it magic... Or maybe hmm... Well, there might be ways now that I think about it, I haven't really needed to make them permanent before... Oh, I know!"
She takes out one of her favorite illusion rocks, nothing more than a well-rounded river stone, and sets it on the floor. Then, building off of it, a 1/8 scale model of the Five Arts Proving Ground, or as it was more commonly called, the Mud Pits.
"One of the wealthiest monasteries in Atsos- Not a religious or academic one, a sorcerer one, so you know, all fighty-"
It is taking shape now, the pool of water around the edge and the strategically placed braziers and metal bits and piles of sand and rocks. She assembles several configurations one after another, before each one condenses down to a little cube and moves to the side.
"-They did exhibition matches, it was a huge show and there was a lot of time and effort on it, very popular. They'd change up the arena between matches. Junior leagues just got flat ground, but others would fight in a fake marsh, or through low scrubland, or 'old ruins'-"
That's probably enough environments for now. She lines them up in the 'stands', little miniature pictures of themselves and a mechanism for touching one to superimpose it over the battlefield. Then come the fighters. These are more tricky; She's taking creative liberties with them, going off memories of people who looked especially cool or strong and filling out the generic person-shaped-actor-template with instructions on what to do (fight the 'enemy') and how to do it (thus and such magic for this one, this type of martial art for that one)...
"...Thuna the lightning knight, Rae and Sen the frostfire lovers, Vee the red frenzy, Chobi the earth-sorcerer, Coops the shadowmancer, Funra the wind-cutter, Glor Dino, and let's add some gribblies also to serve as opponents... If I do it like this..."
She starts having the illusory figures - mostly humanoids, but also a bird-person, some sort of dragonborn, a werefox (not her, someone else), and a few varieties of monsters - fight each other, mostly with pointy bits and bursts of evocation-sorcery, fire and frost and lightning and water cutters and wind gusts, tapping the cube-icons in the stands to swap them out, frequently stopping them and adjusting some aspect of their behavior and then allowing them to go again. She'll be at this, distracted, for a good long while if not interrupted, actually...? It's the kind of creative project you just get caught up in.