Those that bear the ever-burning Mark of Tzeentch have a natural capacity to manipulate magic and a prescience that enables them to alter reality's course.
Source: Warhammer Fantasy: 7th Edition
The Mark of TzeentchURL Copied!
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Ability
The Mark of Tzeentch has the following effects:
It bestows a 6+ ward save upon the bearer. If the model has a ward save from another source then that ward save is instead increased by 1. So, for instance, a Daemon Prince of Tzeentch would have his 5+ ward save increased to a 4+ ward save.
A Wizard with the Mark of Tzeentch has +1 on his attempts to cast spells.