To kill it go on your scorched earth world tame a lightning wyvern transfer it into your extinction world and constantly breath lightning on the desert titan. This is because the lightning wyvern is one of the most powerful flyers.
-Will shock any creatures close to it enough (you will be notified when you are going to be lightning-shocked).
-The 2 tiny, shiny flying swarms are called Flocks, these will target you and you will be notified “You are being targeted by the Flock”, try to avoid this at all cost! It does ~1000 damage to your flying mount and dismounts you, which is really dangerous. Highly recommend that you bring parachutes in case the Flocks attacked you.
-Tail whip when you stand on it’s body, might insta-kill you, not recommended position to stand on.
*These are what I found from my own experience so there could be more attack patterns not being mentioned.
These are what I prepared, which is not so hard to get:
-A decent level lightning wyvern (good stamina is recommended). Just try to spit lightnight at it and avoid the Flock.
-Armor, parachutes, cooked meat (to heal the wyvern in case it got damaged)