Because I didn't want to have a messy fight and endanger the high-quality meat of the Elemental Knights, I slowly approached the Knights while swimming underground, leaving my wives to distract them enough.
I first wanted to catch the one who looked the most interesting to me, the Half-Poison Elf Knight, it was a woman with amazing beauty and a sexy and voluptuous body. However, after experiencing being with my wives, her beauty does not surprise me as much, and I only can see her as a meal, making her a subordinate could be interesting, but the countless hardships I will have to get through by convincing her and all, it discourages me.
Even more, after testing that the Knights possess a partial immunity to my Charm and cannot be enslaved either. At most, I could mind break them through tortures and such, but it would take too much time for me to care enough.