To defeat. From the information I’ve gathered, cover the edges of a desert titan plat saddle with tek (cluster) or heavy (normal) turrets. Have multiple high level carnivores to distract minions, bring a few velonosaurs on the desert titan, make sure they have high stamina, bring both other Titans, farm for a max level mech, and get enough to make a max level mega mech for each player going to the fight. It’s always good to bring a backup mega mech in case the one your using dies. Bring a good assault rifle and 1000 - 2500 ammo. Bring a daedon with high food stat on the desert titan for passive healing velonosaurs and the titan, bring around 50k raw meat for the daedon, starve it before heading into battle, if you beat it with my tips, then you just got tips from someone who hasn’t even gotten an artifact yet, and killed one of the hardest bosses in the game with them.
Alright, since most of these tips are basically useless since most of them is complaining about Fortnite, talking about Pacific Rim, Godzilla, forcetame, marrying it, killing it with a pike and a dodo, and not actually going to make a real tip. (sorry if I am being triggered) What I did was get a max levelled mech blueprint and some auto turrets on a desert Titan of your choice. If you have a friend with you, you either let the friend pilot the desert Titan or control the mega mech. If you are solo, breed about 40 of Level 500 T-Rex (not 500 lvl 40 rexes or else it will be time consuming as well as not able to survive as long especially if it’s Alpha) to distract the corrupted creatures that it spawns and make sure you pop ascendant saddles on them for extra armour. Set the desert Titan on neutral since if it the king titans or the other ones gets close it can protect itself. If you are doing CrossArk, have some wyverns to assist the Titan set them on neutral too and put reapers.🙂
How to kill: all you need is to tame the ice titan, desert titan, forest titan, and two other players. One player can ride the ice titan, one person can ride the desert titan, and the last person can ride the forest titan. And get an army of gigas and make them all kill the king titan. Done, then be zoomin to genesis. (Or whatever map you go to after you kill the king titan)