Heir of Siberys (Sentinel)

You have manifested a Siberys dragonmark, the most powerful kind of dragonmark. The magical tattoo appears anywhere on your body. You gain the following benefits:

• Increase your Wisdom score by 1, to a maximum of 20.
• When you make an Wisdom (Insight) or Wisdom (Perception) check, you can roll a d6 and add the number rolled to the ability check.
• You learn the spell mind blank. You can cast it once without expending a spell slot or using a material component. The spellcasting ability for the spell is Wisdom. You must complete a long rest to regain the use of the spell.