|
Geyser says: "<other stuff and then> In addition, the geyser sprays boiling water in a hemispherical emanation around its square. The radius of this emanation is equal to one-half the geyser's height (e.g., a 50-foot geyser has a 25-foot-radius emanation). Any creature within this area, including yourself, takes 1d6 points of fire damage each round as droplets of boiling water cascade on them."
Say you have already cast the spell. Say someone is outside the effect of the geyser at the beginning of their turn, and for their turn they pass through the geyser's emanation effect, ending their turn outside of the geyser. Further suppose that they only ever enter the emanation effect of the geyser, ignoring the center of the geyser which could propel them upward.
When do they take damage? Never? When they first enter the geyser? When they leave the geyser? Some other time?
|
Subjects, Effects, and Areas: If the spell affects creatures directly, the result travels with the subjects for the spell's duration. If the spell creates an effect, the effect lasts for the duration. The effect might move or remain still. Such an effect can be destroyed prior to when its duration ends. If the spell affects an area, then the spell stays with that area for its duration.
Creatures become subject to the spell when they enter the area and are no longer subject to it when they leave.
By this, I would say that they take damage on entering the area, and then on their turn on subsequent rounds, assuming they do not leave the area.
In your example, they would take damage when they move through, then stop taking damage on turns after leaving the area.
Since it says "any creature in this area" and not "every creature who begins/ends its turn in this area", as some other effects do, I'd say it is the beginning of the casters turn for everybody staying in the radius and the moment they enter for creatures who only pass through.