Well, you could have essentially Light Constructs, like the Green Lantern, except shiny and gold.
If you can make a Hammer of Wrath, why not a chain? Why not a shield? Why not a helmet, or a sword?
Then there’s the idea of what the Scarlet Monks do, where they use The Light to empower their limbs to give them extra striking power, like actual Monks, but instead of using Chi, they use The Light.
Hell, this character is essentially a Paladin/Rogue hybrid. Sacrifice defense in favour of offence and utility.
Then you’ve got different variations on similar spells. Like a shielding spell is normally one-way, protecting you against projectiles and strikes coming at you. Who says it can’t be the other way around, acting as a prison?
What if there was an ability to weigh people down with their sins? Make their movements sluggish, like in a dream?
Why not have the ability to ‘command’? Both Light and Void have shown the ability to essentially dominate the minds of their worshippers. The Light might not be able to directly mind control, but a brief “STOP!”, with that extra weight behind it, might give some weaker minded enemies some pause for thought.
What about “Areas of Sanctity”, which are essentially circles that enemies of the caster find painful to enter?
You could also make The Light form illusions. Make yourself look all blazing and on fire, something truly terrible to behold, even though it’s just a trick and made to make you think the caster is more powerful than they are.
Since The Light is, you know, light, it could be used to light passageways.
The Light and Void are fundamental forces of the universe. They can do pretty much anything with the right mindset. The problem is whether your character is capable of articulating those thoughts in such a way that they produce results, since Light and Void probably don’t come from a purely logical mindset. Where Arcane deals with facts and mathematics (therefore being versatile), Light and Void deal in feelings and faith, which, while just as versatile, is harder to articulate unless you’re experienced.