An aura in D&D 4th edition is a zone centered on the source creature. It passively affects other creatures if they are inside the zone. It is usually easy for the creature to activate and requires no action to sustain.

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Does the Tarrasque cause flying creatures to plummet to their death?

As mentioned in this answer: The Tarrasque's Earthbinding aura ... prevents creatures to fly beyond 4 squares above the ground My question was, if the creature was ~30 squares in the air, and ...