I have scathach assassin at level 62 but I got Marie caster in a yolo, I'm going to roll a lot on illya banner so I hope to get a better caster, so Marie can help me on illya event or is better scathach, I already have Camilla, Medea and Iri at Max level (my only assassin and casters)
Hate to be the bearer of bad news, but most of the enemies and bosses in the Illya event are casters, so assassins will not be particularly helpful. In fact I'm fairly certain there are no rider enemies. You want to be levelling female riders, lancers, casters, berserkers sabers and archers for the event, preferably in that order (or close to it).
Yeah, even Medb and Blackbeard have class changed to Avenger and Berserker as raid bosses
What he said. Alternately you could level a support unit like Hans or if you have waver (zhuge liang) or tamamo no mae caster and use a friend's rider
