Siberys Dragonmark (Storm)

Heirs of Siberys is the term for the few individuals who manifest a Siberys Dragonmark, the most powerful form of a Dragonmark. While this mark most often develops from an existing one, some appear spontaneously and with no explanation. The bearers of this mark are granted extraordinary powers, which can lead to an abrupt rise in ranks within their respective Houses.

A Siberys Dragonmark of Shadow confers the following benefits:

• The die type of your dragonmarked Intuition Die increases by one (for example, from a d6 to a d8). If you did not possess a Mark of Shadow before this, you gain a d4 as your Intuition Die, which works as denoted in the Dragonmark of Shadow description.
• Increase one ability score by 1, either Charisma or Dexterity, to a maximum of 20.
• You learn the spell control weather, which you can cast once without expending a spell slot or using a material component. The spellcasting ability for this spell is Charisma. You must complete a long rest to regain the use of this spell.