Shadow and Light are both intelligence elements. Sittseta and Aprolvys should have equipment that boosts intelligence. Currently Sittseta's equips all boost strength, which does not boost Light's damage output at all.

If you want to deal more damage, you might consider attuning a pet to Air (strength) or Fire (intelligence).

The higher level and rarity of equips you can use, the better. Epic (purple), legendary (orange/yellow), or mythical (red) are ideal.

At the very least, fill all of your pets' equipment slots. The most important thing is having intelligence equips on intelligence elements and strength equips on strength elements.

sorry, I just don't don't get any of this

guess I'll just leave this site for good, it's way too confusing