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Monster Broth is an important crafting material in Monster Hunter Rise that's used in Weapons and Armor. This guide explains where and how to find Monster Broth in Monster Hunter Rise, with details on which monsters drop Monster Broth how to farm them in which location.
How to Get Monster Broth
You can only find Monster Broth in High Rank in Monster Hunter Rise, which is reached by doing Gathering Hub Key Quests. You can get get Monster Broth by carving High Rank Temnoceran and Neopteron - insect-like Small Monsters including Altaroth, Bnahabra, and Rachnoid, with Rachnoid having the highest chance to drop Monster Broth when carving.
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Rachnoid are the spider-like Small Monsters that breathe fire, and can be found in the Sandy Plains and Lava Caverns.
Monster Broth Location
Monster Broth can be carved from all insect-like Small Monsters that appear in all locations, but are most easily found in the Lava Caverns.
The Large Monster Rakna-Kadaki also drops Monster Broth, and there are multiple opportunities to get Monster Broth by slaying Rakna-Kadaki: 20% chance by breaking its Head, 14% with each carve, and 19% as a Target Reward. High-Rank Volvidon by comparison has an 18% chance to drop Monster Broth in the Target Rewards and a 25% chance as a Dropped Material.
How to Farm Monster Broth
You can farm Monster Broth in Monster Hunter Rise as soon as you reach High Rank, and though slaying a Rakna-Kadaki and hunting Rachnoids on the same quest would grant a good amount of Monster Broth, this can't be done until 7-Star Gathering Hub Quests are reached.
The 6-Star High Rank Gathering Hub Quest "The Lava Caverns Sweep" to slay Rachnoid is an easier and most efficient alternative to farm Monster Broth.
A Gathering Palico has the best chance of plundering Monster Broth while out on these quests, too!
As long as you're Hunter Rank 4, a friend can post these quests for you! If not, there's one other great alternative: A Gathering Hub Expedition Tour of the Caverns when there's an Outbreak of Rachnoid, so there will be plenty of Rachnoid to carve for Monster Broth. Check the R button to see Locale Info when looking at the quest to see if there's currently an outbreak. Also, keep in mind, the Outbreak of monsters in a locale will change about every 10 minutes - so you could always leave on a High Rank Expedition to the Lava Caverns regardless, and just slay Rachnoid and hope you get lucky with an Outbreak!