if you're still talking about the Deinos Sauros, here's a comment I found on its Xenoblade Wiki page that might be helpful: "I just defeated this beast in what may be the most shameful way possible. Here's what you need: 1 - Makna Forest access 2 - Melia with Hypnotise and a DOT attack (Poison is best) 3 - Quick Step gems (enough to max out the stat) 4 - At least one ally [cont]