As to what determines the ultimate function, whether transformation or elemental power, I cannot say without further study. The aetherological laws behind this, if indeed they are aetherlogical effects despite my growing doubt, are not ones I am familiar with.

For duration, it depends on proficiency and familiarity. Elemental powers appear to manifest only in minor displays without effort, although transformations likewise are easier and more enduring.

[Venat's scholarly days are long since past, but some things remain with you -- particularly when she has been thrust into an environment that begs consideration of its underlying principles, alien as they are.]