Advanced Runelord Magic

Your ability to use magic associated with your chosen sin grows. You gain the ability to cast one more arcane spell as an innate spell. This spell must be chosen from those available with Expanded Runelord Magic, in addition to foresight, unrelenting observation, or any spell from your chosen sin's school. You can cast this spell as an arcane innate spell once per day. The spell is automatically heightened to a spell rank equal to half your level rounded up. Use mythic proficiency to determine any attack rolls or spell DCs.