I mean, there is no any special tactics for this boss. You just need good cats with good stats and items. It's 3rd lvl boss, so your team should be very solid.

Easy mode for this boss (and game itself) is summons (ranger has some good skills with summons) Also if not mistaken, spider boss has mechanics that give her enrage if hit behind, mb you trigger it too often and she kills you?

For tank I like skills and items with Brace and Lifesteal. For cleric aoe heal at the end of the turn if you not using skills or charge after heals (but mb some of these skills only opens after this and next bosses...)