The surge of Illumination can create convincing illusions, both visual and auditory. This ability is commonly known as Lightweaving, though Lightweavers and Truthwatchers can both use this surge.
Imagining Illusions
Lightweaving is easiest when replicating something you’re familiar with. If you have a great memory or if you reference material you created (such as a sketch, a painting, or a written passage) you might be able to Lightweave something you’ve only encountered a few times—but your Illumination tests to deceive onlookers will probably gain a disadvantage.
It’s very challenging to Lightweave something you’ve only seen in drawings or imagined yourself. It’s up to your GM how difficult this is, but you might face challenges such as a reduced surge size, an additional Investiture cost, a focus cost, an increased DC, or a disadvantage on your d20 roll.
Controlling Illusions
You can control all of your complex illusions that are within your spren bond range. Each illusion can pretend to interact with its environment; for example, you might make an illusionary tree bend with the wind, or make an illusionary child try to catch a ball (but intentionally miss it). However, your illusion has no senses of its own, so you can’t give it tasks that require senses or knowledge you don’t have.
An illusion can move up to your movement rate on your turn in a manner reasonable for that illusion. You can use to have one or more of your illusions perform simple, mindless tasks like walking across the street or shouting a phrase. You can use to task one of your illusions with something that requires your careful attention, such as convincingly conversing with someone.
If you move out of range, your illusions can only perform whatever simple, mindless tasks you last gave them, such as gazing thoughtfully at a bookshelf.
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