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You don’t need to trap this to tame, it’s a solo tame. If you run up to it, it will go into turret mode then you need to walk circles around it and keep hitting with tranq until it eventually tries to walk away *in turret mode so really slow walking*
Make a 2x2 cage with ramps and a door. Lure the velonasaur in with a flyer. If you stay close to him he won’t enter turret mode. Leveling melee raises his projectile hit points. Also level stamina to attack longer. A high level can shred everything I’ve come across. Can’t wait for an imprinted one for the speed bonus.
I found the best way to KO a Velona is by find a destructible rock, which they cant break, and climb to top of it, then just start the process, when it goes into turret mode you can just take a step or two back and it won't hit you but you can still see it and hit it. Once it runs follow and keep on shooting. This has worked for me on my entire Velona Army of 16 Velonas, now time for Breeding. I already got a 267 and 261 female and Male to breed together. Cant wait for an imprinted one. That can solo red drops
Get a wyvern or quetzal and pick the velonasaur up and bring it into a taming pen. If both are not available and you dont have the power to kill nearby dinos, make a trap out of 4 wooden or stone gateframes and gates (add the gate doors to the gateframes otherwise it will escape)
A set of flak, crossbow and a pair of balls you can walk right up to one of these and it'll either run away from you or try to hit you with its needles, run underneath the tail to confuse it and you'll prolly knock it out without much trouble.
This thing is O.P. Use "C" for single target mode. When you are surrounded by many dinos, just trust me, hold right mouse button that will take care of everything. Best idea would be go with stamina and meele.
Little late but... if you build a 1x1 (3 walls 1 door) then add a doorframe ontop of each wall and a ceiling ontop of that you have a reverse taming pen! Stand inside and agrro it and wait for it to be able to be shot through the doorframes. It cant shoot you but you can shoot its head. Easy tsme!
Get a friend with a good riot or metal shield to tank it while you knock it out with a good long neck or shocking tranq darts...it was an easy tame for us, but if you use shocking darts, you have to transfer them over so just use a good longneck.