So for the people who wants to tame this beast easily with tranq arrows:

1. You gotta set up a box trap (My design: 2 stone foundations, 6 stone doorways and a wooden ramp. The normal box trap needs only 1 stone foundation and 4 stone doorways and a ramp, but it has a flaw that when you lure the bear up the ramp, it may jump over the box and kill you. My design is better because the bear will 100% fall inside of it.)

2. Once the bear is inside the trap, shoot it with tranq arrows each per 4-5 seconds. I recommend using the spy glass to check its torpor every time you shoot it for safety of not accidentally killing it. If the hp gets too low and the torpor isnt full yet, just wait until it regens enough hp, and then shoot it again (the HP regen of the bear is faster than the torpor drop, thats why it works).

3. Optional: cover the box with spikes around it so no predators can approach it while it's on low HP

4. While it's regenerating its HP, you can go hunt for some prime meat or do something else if you have a base nearby. You can also get some dinos to come to protect the bear when it's knocked out.

5. Feed it kibbles, honey, mutton, or just prime meat (raw meat is also ok but the taming rate will be lower)

6. Congratulations now you have tamed the beast

More Direbear Taming & KO Tips