Hello, guys!
I started this game 4 days ago. I read many guides but still have a lots of question because there are too much possibilities to upgrade and I dont want to waste the hard earned resources.

My team level is 37 now, I'm on middle of Chapter 5 (Normal) and beginning of Chapter 4 (Heroic) and the battles start to become too hard. I need a little help which heros need to upgrade and which heros leveling should stop. I made a few screenshots about my heroes:




I read Arachna, Gale are must and maybe all of my tanks (I dont know why but Vincent doesnt work well. Many times he just die before life steal so seems a little useless). I cant buy more Eizo stone so he will remain 3*

Elric working better then Drago even though he has lower abilities (15/14/2 for Elric and for 18/18/3 for Drago)
So a few questions:
1. what heroes need to push if I focus on Campain?
2. I already bought 10 Ethera stone in Arena. Was it a good decision?
3. In CoF, I have 1800 scales. Which hero is the best here? Dokras? Tholin?
4. If I fuse while I wear enchanted items will my stat increase with base or the higher item stats? What will I get back when enchanted items are gone? (I didnt read carefully the hints and not really understand).
5. Is the party xp the sum of all battle xp after level up? What is the fastest way to level up?
6. Can I get Cyana stones only this month? I'm VIP 4 now and this wont change too much so I cant reach 4*? (I have 12 stones now and I can get 96 more but need for 4* 150-12= 138 stones. Am I right? Only with VIP 12 possible to reach 4*.

7. Ember doesnt seem to bad but nobody mentioned among the recommended heroes. Only usable on low level?
Sorry for the really long post but I said I'm full with questions.
Thanks in advance for answers.
update: Oh yeah, I just got a Leah from free diamond chest.

update 2: I got Ariel too from a free gold chest.
