What to do if a character dies?
Are their points in the story to regain mythic power?
We haven't had a character death yet, but I worried when that day comes.
You could introduce other Mendevian Crusaders/allies of the crusade who had mythic potential who were in different cities who were close to their wardstones when they went off. Queen Galfrey could have them teleported to the party or something as backup. I've seen others suggest that the mythic power could flow out of the deceased character and go into another nearby person of mythic potential.
As for resurrecting the party... Perhaps Iomedae sends her Herald to resurrect the party member who dies? It might be a good way to introduce him to the party in books 1-4.
You can also find several healing items throughout the books. Towards the end of Book 2 the party is able to find an Oil of Life which acts as True Resurrection. Book 3 has two Scrolls of Resurrection. In Book 4, Cleric NPC Sosiel will be a high enough level to cast Raise Dead spells. Also in Book 4 is a Scroll of True Resurrection. In Book 5, if Sosiel is still around he can get the party access to two more Scrolls of True Resurrection and will be of high enough level to cast Resurrection spells.