Finding seeds in Muck is a challenge. Using some mods however we can help aid us in our efforts of searching through the vast universe of seeds.

Please consult this guide What Mucks Rarest Seed Looks Like?!?! regarding the rarest seed in Muck to find more information on the general process I use.

The spear has a 3% chance to spawn in chief chests; Slight increase from the nightblade weapon that spawns in caves (Check out my Spawn In Caves Seeds?! guide).

Using some mods, I created a way to automatically generate a world, check if there exists a chest containing a chiefs spear, check if it's within <= 30 blocks from spawn (Record seed if true), and repeat. Below is the closest Chiefs Spear Chest from searching through 100,000 randomly generated seeds.

If you are interested in Nightblade seeds, you can check out my World Record BEST Muck Seed! guide for the world record closest Nightblades to spawn seeds.

Please leave me a seed request in the comments or friend me to explain details!