The last for us is Titan, who packs a punch but on my successful attempt he doesn't cast Earth Shaker until death, maybe because I was just physically attacking him or maybe I got lucky. Missile failed to cast several times, still haven't figured out how that works yet. New summon get!
(Game mechanics, don't read if you don't want to be spoiled) Earth Shaker is a 1/3 chance every other round, you did just get lucky.
Missile has a base 75% chance to hit anything not immune (and quite obviously a 0% chance to hit anything that is immune.)