People get hungry faster, food items have a chance of shriveling and
vanishing, plants produce little or no herbs (as if they had already been
picked), channellers get less sps from drain room where there are herbs (as if
they had already been drained?), create herb/create food/satiate
person/hunting/fishing still work to some extent (people with foodish
spells/skills are helpful in a famine), but as the effects increase, even
these people have trouble staying satiated. Whatever is causing it sometimes
snatches rings of sustenance from people, and yields them up when the problem
is solved.

Possibly the problem is solved by killing a monster (analogous to other
events). Possibly Gaia just needs a little reassurance that mortals remember
her (and requires a sacrifice of a sequence of specific foods). Or some other
solution method.

Not just famine event but Four Riders instead.

One would make you hungry.
One would make you sick.
One would make you angry (AoH).
One would make you die.

Apocalypse, NOW!