Heir of Siberys (Making)

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 Intelligence score by 1, to a maximum of 20.
• When you make an Intelligence (Arcana) check or an ability check involving artisan's tools, you can roll a d6 and add the number rolled to the ability check.
• You learn the spell creation. You can cast it once without expending a spell slot or using a material component. The object you create can be up to 15-foot cube and it lasts longer than stated in the spell description. The duration of adamantine, mithral and gems changes to 1 hour, the duration of precious metal, stone or crystal changes to 1 day, and the duration of vegetable matter changes to 1 week. The spellcasting ability for the spell is Charisma. You must complete a long rest to regain the use of the spell.