This battle is simple enough if you have your team of Sabers. However, try not to have a full Saber team, since it'll help on the next battle.
Battle 2
The demons have a tough HP score and they can decrease NP power, hindering your attempt to concentrate on Karna when you have your NP charged.
Karna's NP is a powerful AOE, so taunt won't be of much use once he's the only one behind. Not to mention he can charge his own NP.
Strategies and Recommended Servants
It's recommended to at least keep an Assassin, preferably Ryougi Shiki. Her job is to instant-kill the demons at the 2nd wave before they become troublesome.
Alternatively, you can also try your hand on deploying Saber Shiki since she can do instant-kill on the enemy party and being a Saber class means that she can still handle Karna afterwards.
Since Mysterious Heroine X gets a boost in damage during this event, she can be used as the Assassin to get rid of the demons.
Single-target Sabers shine through in fighting Karna, and even better if they also specialize in critical generation
Your team's NP Levels, the Mystic Code used, the Servant that ends up unused (not deployed), and Command Spells that you used
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