I am trying to beat the guys from the umbra Forest, Faerina's Shrine, the undead guys and I keep on dying so if any imformation on how to beat them that would be great

improve relics armor and level up

You put this in the wrong area but that's ok

Just to tell you this would go in the Battle Discussion I believe!

Okay, first, Rainbow & Starlight both have an unused proficiency point. You need to put that toward something.

Second, both of them have equipment that needs to be switched out. Rainbows relic & armor need to be switched out for ones that are in the same category as his accessories (His relics power is split between physical & magical damage. Because hes attuned to an element in the latter category, the damage he does and that is done to him when hes attacked is the same kind- magical. So he needs a relic that amplifies his skill at that and protects him from only that kind. His armor is best suited to a pet that does & is vulnerable to physical damage, so it needs to be replaced with some suited to a magical pet.). Starlights relic needs to be replaced with one in the same category (categories) as everything else he has, for the same reason I described above in regard to Rainbow. If you dont have enough of the type & category (Epic) you need, I can give you some, as I have extra from completing the Nightfall Bandit Dungeon several times.

Third and finally, you should unlock your third party slot as soon & quickly as you can. You have a bigger headstart than I did when I was at the level you currently are, because you have a Shadow pet and a Fire pet (I had a Shadow pet and a Light pet.), but you need a Light pet to round out your team. Light pets are healers, and, as well as being able to heal themselves, they can essentially (partially) heal the other pets in your party continuously. Thats a big help with this particular group of opponents, especially when, later on, you have to face an army of them, wherein every time you defeat one, its replaced by another (An additional tip about that particular part of this bit of the game storyline: instead of getting rid of the weakest enemies (Risen Soldiers) first, get rid of the mid (Undead Knights & Decayed Archers) and high difficulty (Archmages) ones. That way, in the last round, you wont have to fight three of the last type.).

One last thing. These two guides are good reference for this kind of stuff:
https://www.sylestia.com/forums/?thread=45988&page=1#8
https://www.sylestia.com/forums/?thread=75013&page=1