Easy tame (need Quetzal):

Step 1. Build a bunch of crop plots (recommended large) and plant rockarrot(carrots), savoroot(potatoes) and longrass(corn). Therizinosaurus, as well as most other herbivores, prefer these over the berries. The savoroot and longrass will still be preferred once you run out of Rockarrots. Also farm biotoxin, as this will be an essential part of the process if your desired Therizinosaurus isnt starving upon knockout.

Step 2. Get on your Quetzal and find a wild Therizinosaurus. Then pick it up and carry it to either the Dead Volcano, one of the three Obelisks, or to your base.

(WARNING: Due to their territorial nature, you may need to make room for the Therizinosaurus prior to arrival, including moving your tamed creatures somewhere else).

Step 3. While your tames are away, you may want to invest in some soothing balm. You can either buy it with Amber, or get one of the artifacts from one of the caves and tribute it, as the Obelisks have a chance to reward this with soothing balm.

Step 4. Now you need a sheltered enclosure. This will be where your bed will be so you can suicide to skip the day/night if you arent tired enough to sleep, and will double as a “security checkpoint” if the Therizinosaurus kills you during the knockout procedure.

Step 5. Now you have 2 options. If you aren’t the best at surviving under constant fire, your best bet is to climb ontop of a rock before starting.

However, if you can take a beating, fire away. Do note however that as torpor scales with damage dealt, you might be better off with using an Ascendant bow as those deal somewhat more damage when compared to regular bows. Just be sure to have somewhere above 46 tranq arrows, as you really never know.

Step 6. Starving vs Not Starving procedure:

Starving: The food is all that is needed. You can apply soothing balm if you wish.

Not starving: You need to add bio-toxin into the mix so that you can resupply torpor as-needed. You may also want to apply the soothing balm to let the creature know that you are friend and not foe, which will then in turn make it warm up to you more easily, and thus be tamed faster.

Step 7. You have tamed a Therizinosaurus. Your new friend will now protect you exceptionally well as needed, especially if high level, and with a saddle and enough health, weight and melee/attack, will double as an armored transport for heavy resources.