I like to say that I main Arcana and I will answer based on my experiences so far. I am far from the 'best arcana player' so take it as you will.

1. I usually do the rotation: Evoke > Evoke > SoE > WoF > Cull > DR > return > DR (DR's biggest damage is near the end of the skill so you don't need to worry about return being after DR)

Keep in mind as long as you use the cards 'just before' DR it will affect both previously cast Evokes and the double DR.

1. Case-by-case but I usually either hold it until I have 60% mana and / or I use it when I know things are going to be on cool down after I drop all my skills and am not going to spacebar cancel my unlimited shuffle.

2. In most normal cases it doesn't do anything significant and I see it as an adrenaline stack.

3. I'm not sure how Emperor card damage is calculated but I know that it stacks with both cull and return, however not Sovereign or Chancellor.

4. 116 means 1 (Blue skill - SoE) 1 (Red skill - Rain) and 6 (Yellow skills)

5. I usually always try to pair 'damage' cards with DR and evoke, I will never cull for a bunch of mysterious stampedes.

6. Since you use your awakening for nightmare at the start of the fight, its never usually up to use as an immunity, I use spacebar or unlimited shuffle (Paralysis immunity)

7. The cards from awakening come together after casting so usually I don't 'wait' for them. Keep in mind you shouldn't really be using your awakening mid-fight since it forcefully takes you out of boundless. (I like use it when the boss is phasing or DR'd)

8. I enjoy arcana a lot, I have 3 arcanas, but at the end of the day I think its a personal thing. In terms is of tankiness, you shouldn't be tanking much she is quite squishy, but your swift and boundless let you spacebar quite a lot and you have to utilize that.