Fastest way is to use shocking tranq dart from the fabricator, needs at least 2 people to shoot the head until unconscious. Make sure you use soothing balm cuz it will take most of your day unless you have god mode. Load it full of biotoxin and as much raw prime meat as u can collect. Also use cooked prime meat, it will last longer. And griffins will choose that over normal raw meat. It takes a long time. But so worth it.