Bola the one you want to tame and kill the others (you can bola the others while u kill 1 at a time). After u clear the junk rebola the one you want to tame and place 4 stone fence foundations in a square form around the ravager then place 2 door frame high all around make it 3 to be sure.
Hey just thought of a small trap that a midrange level person could make you have a one by one of stone but instead of walls you have doorframes and one side is double doors thats how you get them in and out and you have a bear trap in the middle you trap it then run over and shut the double doors (i dont know if this is new or can help someone but if it can that would make my day.)
I tamed mine with stone tools and a bow with 6 narc arrows by letting it grab me, hitting it with a bola, and then a shmacked it with a club till it broke free and killed me, literally did this twice and then the third time I was used my arrows and knocked it out. Level 50 surprisingly easy and extremely fun