This spell is a part of the Influence spell chain and is found in the Influence rune stone.
The difference between a weak illusion and a strong one is not complexity. It is conviction. The mentimancer who has practiced long enough begins to understand this - that the wobbling, the tell-tale waver at close range, the way a poorly constructed illusion seems to know it is being doubted - all of that comes from insufficient belief. Dream does not create half-heartedly. Neither should the mentimancer.
Strong Illusion is the same principle as what came before, but held with considerably more certainty. The image the mentimancer constructs through Dream is fine-tuned, detailed, committed to convincing even to those who approach and examine it closely. It does not waver. It does not reveal its seams under scrutiny. The only thing that gives it away is what it has always lacked - physical presence. Touch it and the hand passes through. But eyes alone will find nothing to question. The illusion can be whatever the mentimancer envisions, up to six feet in any direction, and it holds for as long as they choose to maintain it. The mentimancer is free to move, act, and cast other spells while Dream sustains the image they have committed to. Conviction, it turns out, is most of the work.
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