Creatures vulnerable to fire are highly susceptible to intense heat and flames. Fire-based attacks can cause them significant harm, resulting in burns or destruction. Their abilities may weaken when exposed to high temperatures, making it harder for them to fight back. They must avoid fiery environments to survive.
In myth, fire is often seen as a purifying element that can destroy even powerful creatures. This weakness forces these beings to steer clear of volcanic regions, fire magic, or any source of extreme heat.