Hero From Another World

The vast entity (Ao or similar), it did not merely grant you power, but ignited a latent potential deep within your soul, creating an Innate Font of raw magical energy. This personal reservoir of power functions entirely outside the constraints of the Weave (or similar magical structures).You gain a single special spell slot fueled by this internal Font of mana.

• This spell slot starts as a 1st-level spell slot at character level 1.
• The level of this spell slot increases as you gain character levels: it becomes a 2nd-level slot at level 3, a 3rd-level slot at level 5, a 4th-level slot at level 7, a 5th-level slot at level 9, a 6th-level slot at level 11, a 7th-level slot at level 13, an 8th-level slot at level 15, and finally a 9th-level slot at level 17.
• You can use this spell slot once per long rest to cast any one spell of the slot's current level or lower, from any class's spell list.
• You do not need any material components (including those with a gold cost) to cast the spell using this feature.
• Casting a spell this way still requires the normal verbal and somatic components, if any. You might perform these instinctively, awkwardly mimicking half-remembered gestures or sounds, or perhaps the power simply erupts from you in response to your will, fulfilling the components mystically.
• If the chosen spell requires concentration, you must concentrate on it as normal.
• You do not know any spells inherently through this feature; you simply choose one spell to manifest each time you use the slot. Think of it as reaching into your Innate Font and shaping the raw potential gifted to you into the specific magical effect you most desire or need in that moment. 
• Furthermore, your soul bears an undeniable mark from the entity that granted you this second chance. Deities lesser than Ao can perceive this mark, recognizing your otherworldly origin and sensing the touch of supreme authority upon you – marking you, in their eyes, as akin to 'Ao's Chosen' or touched by something similarly fundamental. Whether out of deference to the Overgod, adherence to cosmic hierarchy, or simple prudence, such deities will refrain from directly targeting you with their own divine spells, powers, channel divinity effects, or curses. They perceive you as operating under a different, higher sanction. However, this divine recognition does not shield you from the actions of their mortal (or immortal) followers, nor does it protect you from the indirect fallout or consequences of divine machinations or interventions in the world.