Ok first you should start with a low level cos a low one is better than non! Build pillars around it to block its way of getting to you. Build rocket launchers (2 for a level 4) and just start to hit its head. Makes sure you time it right otherwise it won't do torpor if it hits the body.
It's a bit silly that kibble tames it a lot better than rocks or sulfur because even in the dossier it says that it lives off of absorbing nearby rocks and minerals. So mabey they should make it so you have to feed them a rare mineral like obsidian what if they made it so you could tame one fast and with high effectiveness by giving one a few hundred or few thousand obsidian . or what if there kibble was made out of a combination of ores and minerals .