# Shadow Dragon ## Regional Effects _Source: Monster Manual (2024)_ The region around a shadow dragon's lair is twisted by its presence, creating the following effects: - **Negative Energy Suffusion.** Whenever a creature within 1 mile of the lair regains [Hit Points](/Rules/Source/variant-rules/hit-points-xphb.md) from a spell, it subtracts `dice:1d10|noform|noparens|avg` (`1d10`) from the number of [Hit Points](/Rules/Source/variant-rules/hit-points-xphb.md) regained. - **Stifling Shadows.** Within 1 mile of the lair, effects that normally create [Bright Light](/Rules/Source/variant-rules/bright-light-xphb.md) instead create [Dim Light](/Rules/Source/variant-rules/dim-light-xphb.md), and creatures there have [Advantage](/Rules/Source/variant-rules/advantage-xphb.md) on Dexterity ([Stealth](/Rules/Source/skills.md#Stealth)) checks. If the dragon dies or moves its lair elsewhere, these effects end immediately.