Don’t put quotations (single or otherwise) around protectors unless you mean to indicate that they’re called protectors but aren’t.
Is it the same artistic ability for every protector? If so, why not just name that ability? And if not, either change All to Each or change an artistic ability to artistic abilities.
Add a comma after them. (Yes, it matters. Leave the comma out, and you’re saying the combat skills got an artistic ability instilled, too. *shakes head*)
Change the comma after skills to a period.
Delete the before future.
Each of the protectors had an artistic ability instilled in them, as well as their combat skills. This was so they could document all events that took place, for future generations.
Apparently someone thinks it’s odd/highly unusual for a person to naturally possess both combat skills and artistic abilities. *shrug* Maybe it is. What do I know? For anyone, “normal” is whatever we’re used to/familiar with, so it does seem normal to me.