A sorcerous portal is prone to appear where certain contours of hill and valley funnel the Winds of Magic in unexpected ways. Many are caged and harnessed by ambitious sorcerers, but wood and stone cannot easily contain raw magic.
Source: Warhammer Fantasy: 8th Edition
Sorcerous PortalURL Copied!
At the start of the Magic phase, after power and dispel dice have been generated, but before spells are cast, the sorcerous portal belches forth energy in the form of a spell. Roll 2D6 on the table below each time to see what spell is cast.
The spell does not need line of sight, always targets the closest unit (regardless of range, if the unit is in combat and so on), is automatically cast and cannot be dispelled. If the spell has a choice of casting values, it is assumed to be cast at the lower value.