Arcane Wellspring

This spell creates an arcane mechanism that resembles a floating collection of crystalline gears and clockwork known as an Arcane Wellspring. It occupies a 5-foot by 5-foot space and hovers two feet above the ground, anything attempting to move into that space is pushed back. 

While the Arcane Wellspring is in existence any spellcaster within five feet, as a bonus action, can expend a spell slot of up to 5th level to transfer that spell slot to the wellspring. The wellspring can contain a number of spell slot levels equal to half the spellcasting class levels of its creator rounded down (an 18th level wizard's Arcane Wellspring could hold up to nine spell slot levels). As an action, any spellcaster within five feet of the wellspring can draw on the spell slots within it to transfer a number of 1st, 2nd, and 3rd level spell slots equal to the number of spell slot levels contained within the wellspring (if the wellspring contains five spell slot levels a spellcaster could use it to gain a 3rd level spell slot and either two 1st level spell slots or one 2nd level spell slot). A spellcaster can transfer spell slots into or out of an Arcane Wellspring a number of times equal to their spellcasting modifier, once they have reached that number of transfers any additional transfers causes a level of exhaustion. Once the spell ends any spell slot levels contained in the wellspring are lost.

Dispel Magic will automatically destroy an arcane mechanism.

No one can have more arcane mechanisms in existence than their proficiency bonus at any given time. The creator of an arcane mechanism can choose to destroy it at any time as an action. If someone has the maximum number of arcane mechanisms in existence and they attempt to create a new one the oldest arcane mechanism they have created is destroyed. If the creator of an arcane mechanism dies any mechanisms they have in existence are destroyed unless it is specifically stated that they persist.