War Banner

You summon forth a War Banner to bolster the combat capabilities of your allies. Choose any unoccupied space that you can see within 30ft of you. An indestructible War Banner of your design choice appears within that space. The banner is of a Medium size, but is considered ethereal for the sake of moving through it. Any creature of your choice within 30ft of the banner gain +1 bonus to their attack rolls and their weapons are considered magical for the duration or until they leave the area of effect.

For each level of spell slots used to cast this spell beyond 1st, the Area of Effect increases by 10ft. For every 2 levels of spell slots used to cast this spell beyond 1st, increase the bonus to attack rolls by 1.