Greater Mark of Warding

Your dragonmark increases in power, greatly improving your knack for keeping valuable things safe. You gain the following benefits:

• Increase your Constitution or Intelligence score by 1, to a maximum of 20.
• The die you add to ability checks using your Warder's Intuition trait changes to a d6.
• You learn the glyph of warding and nondetection spells, each of which you can cast once without expending a spell slot or material components. You regain the ability to cast these two spells in this way when you finish a long rest. Intelligence is your spellcasting ability for these spells.

Option: Siberys Mark of Warding
At the DM’s option, a character who has the Greater Mark of Warding feat has a chance of manifesting even greater power: a Siberys dragonmark. Upon reaching 13th level, such a character has a 10 percent chance of gaining the following benefit:

• You learn the guards and wards spell and can cast it once without expending a spell slot or material components. You regain the ability to cast it in this way when you finish a long rest. Intelligence is your spellcasting ability for this spell.

If the character fails to gain this benefit, they have a 10 percent chance the next time they gain a level.