invented to keep out the cold
"The cave connection most likely includes a link to the boggard village, and from that direction we would have a choke point. They might not conveniently assault us all in our prepared location, or it may not connect directly. We could infiltrate via Invisibility, at the cost of Invisibilities cast, but that would shatter the moment we struck. We could first strike at the hydra, and hold our assault upon the boggards for tonight when they will mainly be sleeping. They may leave sentries, but sentries are more easily handled, and images may force a regular wake until they disregard calls."
She stops and thinks. "Yanor, you said you had a war-distance plant awakening spell? That may disrupt them sufficiently to permit our entry, and perhaps our safety. Tomas, if you have any similar options they may work. Any such attempt can be aided with Images if we think it needed."
And back to Tomas. "As for the hydra, we should at least determine its strength, if nothing else. A five-headed hydra falls within moments if assaulted by an invisible and well-trained combatant, a ten-headed hydra is a hopeless fight and we know to stay well away and flee the area if we see a sign of its presence. Invisible observation should be possible, if nothing else?"