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incognito said:
a) how many gems to put into a single dome... this seems to be a trade-off between the dome shattering soon anyway from enemy spellcasting and the cost of recasting
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The dome of arcane warding stays up regardless of whether a spell goes past it or not. The dome of solid air and dome of trees always costs costs the same. The only ones where this really matters are the frost and fire domes.
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Does this happen or is it just an erroneous description?
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Yes, this happens. Spell descriptions all tend to be accurate in what the spells do.