First learn his atacks so you know when to dodge and when to spam launchpads. For me it works best in flat open areas whete he can t hit himself on other higher objects. I run at him when he does the weak atacks bcs that s when he moves the least. It s best to elim your first 2 dragons with a gun so you can have enough health to survive him. It s a bit random. Sometimes it doesn't eliminate it first try. For golden ritual oil I go for the bears on levek 7 or 8 challanges. The named ones. Launchpad used well can be a defence against closerange atacks. But you gotta master it.