I've been listening to Hardcore History and I found it odd that the Mongols, in a quest for power and empire, never stopped at India to take it. They went to Kazakhstan, the middle east and invaded China yet no mention of going to India?

Looking back, I never hear much about India only a story in which Alexander the Great wanted to push forward but his army was exhausted. Looking at wikipedia, there seemed to be a lot of in- fighting but never any outside mentions until the spice trade era.

My question, is there any texts that painted India as a mythical place that you shouldn't dare go to? The Mongols, who met met knights at the height of the era didn't even flinch while crushing them. Why wouldn't they head to India?