What can possibly be a dragon's weakness for it to be defeated in a story

1. Vulnerability to certain magical spells or charms: Dragons may have a weakness to specific spells or enchantments that can weaken or defeat them.

2. A specific type of weapon or material: It could be that dragons are susceptible to a particular type of metal or weapon that can pierce their tough scales and defeat them.

3. Fear of a certain element or substance: Dragons may have a fear of fire, ice, water, or other elements that can be used against them in battle.

4. Trickery or deception: Dragons may be easily deceived or outsmarted by clever characters who use cunning tactics to defeat them.

5. Exhaustion or fatigue: Dragons may have a limitation on their stamina and energy, making them vulnerable to being worn down in a prolonged battle.

6. Emotional weakness: Dragons may have a vulnerability to emotions such as greed, pride, or loneliness, which can be exploited by characters seeking to defeat them.

7. A specific weakness inherent in their biology: Dragons may have a weak spot, such as a soft underbelly or a sensitive area, that can be targeted to defeat them in combat.