Azor's Deployable Dome Saga

You produce a dome of abjuration energy capable of stopping any harmful effects from penetrating it. Your Initial Casting of this Saga produces a 5 ft radius immobile dome of semi-transparent abjuration energy around and above you and up to 3 other creatures of medium size or smaller, remaining stationary for the duration. The spell ends if you leave its area. All other Creatures and objects that aren't projectiles can move through the dome freely.The dome has 50 Hit Points and blocks any magical/physical ranged attack from penetrating it and suffering damage those attacks deal. Spells and other magical effects can't extend through the dome or be cast through it. Outside spells with areas of effect damage the dome without affecting the creatures inside and spells targeting creatures or objects within the dome instead deals damage to the dome equal to their spell level times 10. This Saga ends early if you lose concentration or the dome ever drops to 0 Hit Points while completely deflecting the final source of damage.

Each round you maintain concentration on this spell, You Produce the following Persistent Effects:

Round 2-5. The dome gains an additional 20 Hit Points.

Round 5-9.  Select one of the following triggers:

• The dome gains 30 additional Hit points.
• The dome's radius expands by 5 feet. covering 

Round 10. The Dome Remains active until Dispelled or it drops to 0 Hit Points. Once this Saga is complete, you may also move freely through the dome.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, The dome has an additional 10 initial Hit Points and gains an extra 5 Hit Points on following rounds for each slot above 3rd. Alternatively, on rounds 5-9, the dome's radius will also expand an additional 5 feet for each slot above 3rd.

 Convoke. Whenever an additional caster casts the same Saga at an equal or higher level than the original, they may stack each trigger of the spell an additional time. The spell remains convoked as long as more than one caster concentrates on the Saga.