Gargantar

Requires Dragontopia. Let its spit build up the debuff that allows it to swallow you, then drop equipment inside its stomach to make it fall asleep. Mount it when prompted and inhale each requested resource until its bar fills. Complete the three requests, then repeat if needed. These resource challenges are required; ordinary inventory feeding does not tame it.

You need Dragontopia to tame Gargantar. Let its spit build up the debuff that allows it to swallow you, then drop equipment inside its stomach until it falls asleep. Mount it when prompted. While riding, inhale the resource shown by the taming challenge until its bar fills, before the timer expires. Follow the next requests and repeat the entry and riding process if needed. The requested resources are wood, keratin, metal, raw prime meat, stone or raw meat. Ordinary food placed in its inventory does not complete these challenges.