Blight is a corrupting influence that turns the land under an Undead settlement to rotted soil.
Most Undead buildings must be summoned on blight. Only two buildings can be summoned on normal land: the Necropolis and a Haunted Gold Mine. Once completed, these buildings generate a radius of blight, upon which subsequent Undead buildings can be summoned. Each additional building you summon extends the radius of blight further.
Other races can build buildings over blight without any negative consequences.
The standard (non Hero) Undead units only regenerate hit points while on the blight. Off the blight they do not regenerate, neither in the daytime nor at night. Undead heroes' health regeneration is increased on blight.
Creation and Removal
Undead buildings (other than a Haunted Gold Mine) generate or increase the radius of blight. Undead's Main Buildings generate way more blight than other Undead buildings.
Undead can also buy the Sacrificial Skull from their Tomb of Relics to generate a small radius of blight somewhere on the map. This is useful to fast expand (and protect the expansion by building towers).
Blight can be dispelled once the building that generated it has been destroyed or unsummoned. As blight is not targetable only area of effect dispel abilities can remove it, for example Wisp's Detonate.
Non-Undead buildings also have a special ability to dispel blight. Only blight that was created by buildings and has no source buildings nearby can be removed with this ability though.
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