Okay,so the 'Mob Of Undead'? I can't defeat it!!!It's so hard and my pets are level 32,as for the Mob is levels 30-34.I have no idea how to beat it.I've been trying for days now.Any advice?

With mobs, the best way to go about it is to always aim for the strongest (highest number of stars) opponent. So once you kill the strongest of the initial three, that slot will be filled with the next opponent, and you pick the strongest out of the two old ones and the new one, knock that one out, and repeat.

Other things:
Do you have your third pet slot bought (should be buyable in Sanctuary of Saerielle); the third slot makes everything easier.
And...
Pet Setups
(give us a moment to check yours)
okay, let's see, you have
Frostbyte and Starstorm on active party

Frostbyte is your HP pet (with some Str?)? by the looks of it? and Starstorm is Str.
We don't know what their Proficiencies are, so we can't comment there (most common setups have the Tank (HP+Agi), a Mage (Int+HP/Dex) and Fighter (Str+HP/Dex))
First thing, looking at those two, that you'll want to do is get them better equipment.
All of their gear is either Common or Rare, and of all different types (We went over a breakdown on stats/what they mean and how equipment is set up here, and there's Battle Party and Speccing/Gearing threads in the Guides section)
Higher rarity equipment is preferable for its higher stats

Frostbyte is
level 32 and has...
Lv20 Rare Phys damage/Str+Agi spread Relic
Lv20 Rare Int+Agi Armor
Lv25 Common Dex+Agi Accessory
Lv20 Rare Str+Dex Accessory

Starstorm is
level 32
Lv10 Common Phys damage/Str+Dex+Agi only Relic
Lv15 Common Str+Dex+Agi only Armor
Lv5 Rare Deciple Accessory
Lv5 Common Str+Dex Accessory

Both pets could do with a major level upgrade to their equipment, preferable a rarity upgrade, and specification focus (equipment with an even spread of stats lacks the higher bonuses of the more focussed equipment)

Thank you so much!I agree though they do need some armor updates;Thanks!

would you like me to send you my best unused equipment? the other person said you have a strength and a physical tank? it will all be a low enough level for your pets (probably) if you get a magic attacker let me know

Thank you so much! This helps alot :)