Change Sunsword to Sunshield, a shield of light (or shield of reflection in variants that lack a shield of light) which does not impede spellcasting when worn.

It should be possible to combine chromatic dragon scales with a shield of reflection at a forge to make a “chromatic shield” which provides the same benefits but in shield form. This is so tortles who get chromatic scales can get some use out of them.

Shields of reflection can be applied in a direction which is equivalent to using a mirror in that direction.

If you have a silver non-reflection shield, a towel, and grease, you can turn it into a shield of reflection by polishing it.

Replace the shield of reflection with a “polished shield”, which is nonmagical. It can come in any material, but only brass, copper, silver, and gold are shiny enough to make it also confer reflection. (That is, you can have a polished wooden shield or a polished iron shield, but the material just isn’t lustrous enough.)

Artifact shield of reflection that reflects thrown or fired projectiles.