1. Raid is very good in distracting the players. 🙂
4. Ok, I wasn't sure if you know. Some people here in the forum level up the food champs for no reason, it's a quite commen mistake.
6. Champion slots are something worth to invest some silver (early expansion stages) and gems (later stages). If you run out of slots, save your silver until you can buy 10 more.
6a. Relickeeper is a bad champ, you don't need him. But you still have to build him in the fusion, it's part of the quest to get Arbiter. Collecting him from a shard doesn't count for the quest. This fusion has to be done.
6b. Rhazin is a strong champ.
6c. Broadmaw is not among my favourite champs, and with Tagoar you allready have a reviver. But in the end, Broadmaw has his niche use in the faction crypt. You can't bring Tagoar to the lizard faction wars. Later in the game definetly worth building, so keep the rares for this fusion.
7. If there are more epic champs, maybe you could show the rest of your champion roster.
From the champs shown here, I would probably not max High Khatun for now. As long as she doesn't die, she can do her stuff with lvl 50 as good as with lvl 60. I would remove her from the CB team, she is not really good for that content of the game. The clan boss is immune to slow and turnmeter reduction, her speed buff is literally the only thing she provides here.
I would go with Sinesha next. She combines healing with quite good damage and her A2, wich can put skills on cooldown, is really good for arena, even if it's only single target. This ability can't be blocked with block debuffs, an opponent hit with this skill will still be set on cooldown. It can be resited by the resistance stat and needs accuracy to land. But in early arena, most people don't tend to use a lot of res on their champs, especially if they have someone to block debuffs and think they are safe. Another point for Sinesha is her affinity. All of your 3 lvl 60 champs are magic so far, that may lead to problems in your dungeon progression in force affinity stages, where all of them are weak. Sinesha as force affinity damage dealer could help here. The game consideres here as a support champ because she can heal, but don't follow that description. She is a damage dealer with additional healing capability. Definetly go for damage (and accuracy for her A2) on her equip.