Marrowblight

Causes disease (Fortitude save should be appropriate for CR).

As a standard action, a marrowblight can leap up to 15 feet into an empty space, provoking attacks of opportunity as normal for this movement. Each creature in a square adjacent to the marrowblight at the end of its movement must succeed at a Reflex saving throw or gain the off-target condition for 1 round. Creatures that fail this check by 10 or more are also knocked prone. The marrowblight can exclude a number of allies from this effect equal to its Intelligence modifier (2 for most marrowblights).