With the invention of the radio and recorded media, many bards have turned to these tools as new ways to express themselves. Some choose to record their performances, be they music or poetry, for later playing and distribution. Others continue to perform live, but use recorded media to provide background music and effects.
At 3rd level, you convert a mundane vinyl record into a spelldisc. Over the course of a short or long rest, you may convert a mundane vinyl record into your spelldisc. This vinyl record becomes much more durable, gains the ability to hold a seemingly infinite amount of audio, and can be used as a spellcasting focus for your bard spells.
You may only have one spelldisc at a time; if you create a new spelldisc while a previous one still exists, all magic fades from your previous spelldisc. When you create a new spelldisc, any audio present on your previous spelldisc is magically transferred, even if your previous spelldisc was destroyed.
As an action, you may record anything you can hear into your spelldisc, and you can repeat this action over multiple rounds to record longer sounds, such as a song or a conversation. You may also use your action to play any audio you have recorded, and can likewise repeat this action to play audio with longer durations. You may erase any length of audio recorded onto your spelldisc with an action.
You must be within 30 feet of your spelldisc to use it as a spellcasting focus, and to use any features from this class that involve your spelldisc.
Also at 3rd level, you gain the ability to use your spelldisc to assist with concentration. When you cast a spell that requires concentration, you may cause your disc to magically spin and help to maintain the spell effect. When you do so, you no longer need to make concentration checks to maintain a concentration spell after you take damage.
Beginning at 6th level, you gain the ability to replay a spell that has been cast, though at the loss of some fidelity. When a creature within 30 feet of your spelldisc casts a spell, you may use your reaction to expend a bardic inspiration die after all spell effects have resolved. When you do so, you cause the spell to be cast a second time, at the same level and targeting the same creatures or area.
The spell cast using this feature is only an echo of the previous spell, and loses some of its potency. If the spell allows for a saving throw, roll a d6 and subtract the number rolled from the save DC of the spell. Similarly, if the spell deals damage or restores hit points, these effects are half of the total of the resulting rolls.
If the recast spell requires concentration, you must maintain concentration on the spell.
At 13th level, your spelldisc can now play audio that allows it to entirely maintain concentration on a spell effect on your behalf. When you cast a spell that requires concentration, you do not need to concentrate on the spell, and can instead cause your spelldisc to rotate on its own. Your spelldisc may only maintain a single concentration spell on your behalf at a time, and you cannot use your Spellspinner feature while it does so.
Additionally, a creature may attempt to interrupt your spelldisc to end the effect. If a creature is within 5 feet of your spelldisc, it may make an attack roll or Dexterity (Sleight of Hand) check against your spell save DC. If the spelldisc is on your person, their roll is made with disadvantage. On a success, the spelldisc skips, and you must begin concentrating on the spell to maintain its effects.