Auras are normally visible to all players at all times. However, it is possible, starting with Maptool 1.3 Release (1.3.b64), to designate an aura as visible only to the GM. This helps in situations where the players shouldn't know that they've wandered into the spy camera's sensor range, or when they're too close to the Frost Witch and are going to freeze, and so forth. To designate a GM-only aura, use the following method (adapted from a post by jfrazierjr, the developer of the GM-only aura functionality):
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Auras
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Aura 5 : aura square GM 1.5#ff0000
Aura blue 10 : aura square GM 2.5#0000ff
Aura 10 : aura square GM 2.5#ff0000
Aura Player Also 10 : aura square 2.5#ffccdd
Notes:
1. If the "GM" tag is placed in a light type that is NOT an Aura, it will be ignored and not written back out when the panel is reopened.
2. For each Light GROUP, if the group has NO sub items that are player viewable, the group will NOT be shown to players as an option in the Light Sources context menu.
3. Likewise, if a group is visible to the player, but some of the lights in that group are GM only, those light types marked as GM will not be shown to the player.