Only in cloud form

Only in cloud form is an Accessibility limitation serving as a Mitigator for the Mute disadvantage that the Arendians on GURPS Horror page 85 suffer.
Arendians have Body of Air elemental meta-trait, the key aspect in question being Diffuse which this probably refers to.
Although some parallels can be made to the Only When Insubstantial limitation (which is -10%) Arendiens do not actually alter their forms: instead they use Possession (advantage) with Parasitic so "in cloud form" basically just refers to "while not possessing someone".
Essentially what this really operates like is taking a Not Mute advantage (per Counter Advantages) and applying the -40% limitation Only on possessed form to reduce 30 points to 18 points: the net cost of that when combined with -30 is -12 points, the equivalent to taking a -60% mitigator on Mute.
*this means that -10% is underpriced: Mute gives too many points here when you can easily turn it off by possessing someone!
The mitigator actually doesn't make much sense because Mute is a physical disadvantage and you don't bring those along with you when possessing a body anyway: you gain the physical advantages and disadvantages of your host when possessing them.
Only outside host is essentially the same idea but in different words when mitigating the Weakness disadvantage. It's not clear why separate phrases were used.
Category:Accessibilities