Quote Originally Posted by Cobblemaniac View Post
Here's an advice you probably won't like: NEVER res in any raid or advent event, let alone res 5 times. Save your gems.
Although for future reference, there are times when it's arguable to res during advent ragnarok. But only when that res guarantees victory, as then you're effectively making a trade of 100 jewels for 1 core (or 2 cores if you haven't gotten the first clear reward yet). For that to be a worthwhile trade, you need to understand exactly what you're getting out of it and why you'd do it. And it'd be for very situation specific reasons, so the general rule is still don't res in raid/advent events.

For the unregistered asking the original question; ignore what I just said above. Just completely forget about the resurrection option for the time being.