So here's how I tamed my rex, 1:you kinda gotta have a flying dino a tapejara is VERY RECOMMENDED I used one too tame my rex so anyway since the tapejara's saddle has 3 seats you could bring a friend to ride on the back 2:craft a crossbow (recommended) and some tranq arrows will do (87 or more or less), But you must be a very skilled ark player to use a normal bow to knock a rex out as normal bows have low durability and power but do, um sort of alot of tranq damage so I prefer bringing a crossbow, you will knock a lvl 2 rex out VERY EASY with maybe say, about 57 or more tranq arrows and you don't really need that much narcotics for a lvl 2,(these are just tips for lvl 2 rex taming anyways) 3:drop your crossbow and tranq arrows for your friend (or if your playing on Xbox and playing couch co-op give it to your couch co-op freind) make sure your freind is on the BACK seat of the tapejara saddle, OH! And bring Alot of narcotics if your planning on taming a high level rex, (to make narcotics craft a mortar and pestle get as much spoiled meat as you can(and narco berry's) then put them in the mortar and pestle and don't forget to unlock the engram "narcotics" then craft as much as you can (end of narcotic introduction) 3: okay your almost ready to tame a rex 👍 then gather ALOT of meat, then you and your partner should fly too (locations of rexes: mountain's RARELY, the best place of all is "carno island" you should look on your map and see a big island just this way ↗️ up on your map radius go there, carno island is VERY DANGEROUS though because of sabertooths, carnos, alpha carnos, (argentavis's, aka giant hawks) and alot! Of rexes then fly there on your tapejara with your tribe member, you should fly close and above a rex to get it's attention(agro) then THIS IS WHERE YOUR TRIBE MEMBER MUST START firing the tranq arrows at the rex (most likely to shoot it's face, keep flying over it and your tribe member shooting down at it until it starts to flee, the person riding (controlling the tapejara) must fly after the rex as fast as you can! AND YOU BETTER HAVE BROUGHT ENOUGH TRANQ ARROWS TO KNOCK IT, (TIP you must know:face the back of the tapejara at the rex your tribe member is firing at so your tribe member can get a wayyy better shot at the rex)4:if you chase down the rex and your tribe member keeps winging it, will those 87 arrows or more the rex should eventually drop, depending on the level of it, a lvl 2 rex doesn't take that much arrows but bring Alot just in case anyways when the rex drops put your narcotics in it's inventory (and raw meat) then your good to go if it's torpor (the purple bar\knockout bar (how long it's asleep, only seeable while close to the unconscious animal.) Is depleting or almost fully depleted you should feed it the narcotics that are in it's inventory (RT, to feed sorry idk what button it is on Computer\PC) it will automatically feed and tame on it's own but force feeding it will not work and fill the taming bar, so just leave it for a bit or protect your unconscious rex and wait until it's fully tamed and yours and keep an eye on that torpor! 5:if you successfully tame it you now have a killer beast in your hands if you already crafted a saddle for the rex you can then kill everything in your path but if not go craft one,( it is does require kind of alot of ingredients to craft a rex saddle here are the requirements (380 hide,200 fiber,50 metal ingot) well that is the full tutorial on how I tamed my rex his name is Ray he's a lengthy lvl 84 welp I hope this helped bye 👋.

I was level 20 and watching a battle, bronto vs. Rex and 4 raptors 1 alpha it was cool, until I fell of the cliff I was standing on and was at half health but the rex couldn’t see me because it looked like the bronto looked at me and attacked the red to distract him. One up equals 1 respect for big ol brontos

Look

1 petrandon

And 1 soothing balm

And 1 primal meat

And a bow with 10 Tranq arrow

Let your petrandon have a battle with him or her and you can shoot the arrows from a far

When he's or her get knocked

Whilst you're petrandon for passive

And then tame it with soothing balm and 1 primal meat

Easy!!!!!!!

I'm in level 53 and I have 2 spino and 4 rexes!

Good luck

If you have something like a Diplodocus or something else that’s taller than a Rex before you start shooting it with your Trank arrows or darts In standup on top of it once you do that, then you can start shooting it It should come up to your dinosaur, but since your dinosaur so tall, it won’t be able to attack you and it won’t attack your dinosaur because your dinosaur isn’t related to any harm that was up to it. I tested at this method myself, but don’t blame me if it doesn’t work it’s either your dinosaur is too small or something went wrong.

Just tried taming a Rex. I brought a bit more tranqs than the taming calculator told me too. I hit the Rex with every shot and low and behold. Not even half torpor done. The calculator has been off for me before but not by this much. Just letting you know so you don't almost die like I did :)

First get a ascendant rifle then load it with 200+ tranq darts the. When it’s knocked out put spikes around it (wouldn’t recommend metal as it uses too much metal ingots) then go to the south zone 2 cave and get the artifact and then tribute it for a soothing balm then after that feed the red then go to sleep then when you wake up get your Dino and kill a low lvl stego nearby for prime meat and feed it to the Rex

Want a op Dino here

Step one find a Rex

Step two knock it out woth tranq dart or arrows and surround it with fences

Step three give it prime or reguler meat and bring naracotics

Step 4 if you want to tame a really high level bring soothing balm

Step 5 get a saddle for it

And boom tamed