Dweomersynd’s Mnemonic Bubble

You weave a shimmering, palm-sized sphere of storage energy that floats near you, attaches to your clothing, or sits securely in your pocket. This bubble must remain in your possession; if it leaves your person or is touched by another creature, it instantly vanishes, wasting any spells stored within it.

When you cast this spell, you must immediately expend your own spell slots to cast other spells into the bubble to be stored. The stored spells must have a baseline casting time of 1 Action or 1 Bonus Action, and cannot be cantrips. The combined total levels of the spells stored inside the bubble cannot exceed the slot level used to cast Mnemonic Bubble.

Using the Bubble:

Only you can activate or use the bubble, choosing one of the following options:

• Release (Magic Action): As a Magic action, you speak the name of a single stored spell. The bubble casts it instantly using your spell attack bonus or save DC. If the spell requires Concentration, you must begin concentrating on it normally.
• The Overload Throw (Action): You use your Action to throw the bubble at a destination or creature within 30 feet. If targeting an unwilling creature, make a ranged spell attack roll. On a hit (or automatically if targeting a willing creature or an unoccupied space), the bubble ruptures, and all stored spells detonate sequentially in an order you choose.

Concentration Limitations:

You are the source of all spells cast by the bubble. If multiple detonated spells from an Overload Throw require Concentration, you can only choose one to maintain. Any other detonated spell requiring concentration instantly ends at the conclusion of your current turn.

System Constraints:

You can only maintain one Mnemonic Bubble at a time. Casting this spell again causes your previous bubble and any unspent spells inside it to vanish harmlessly. The bubble lasts for 24 hours or until all stored spells are expended.

At Higher Levels: When you cast this spell using a spell slot of 4th level or higher, the maximum combined level of spells you can store increases by 1 for each slot level above 3rd. This spell cannot be cast using a slot higher than 6th level (maximum of 6 stored spell levels).