You hit it with cannons on a quetzal. Go for it’s head. It’s torpor won’t drain either so take your time. They can’t eat just stuff a platform saddle on the titan once KO’ed. You use daedons to heal it when it’s food level is low.
So, if you want this... tranqs are not the way to go, you want a quetzal or brontosuarus. Make a platform saddle and build connon shooter(in my language this is what we call it) and you must shoot at its head and you need a lot of cannon balls.
You can't tame this big chunk with tranq arrows, you have to use Canon balls and shoot right at his head. He will make a small animation if you hit, its easiest if you build the canons on a Quetzal of course on a Platform saddle(Lvl 97) I promise, its gonna take long, Very long.