When you reach Messia 224 in Tales of Arise, one of the subquests you can pick up is called Hard Liquor, and you can pick this quest up by speaking to a certain NPC in the Village.
This NPC will ask you to gather up a total of four Earth Seeds so that he can turn them into a special Denan booze or moonshine. To get Earth Seeds to complete the quest, you will need to defeat roper enemies.
Chances are, you already fought these enemies as a few spawns in Ulvhan Grotto but Earth Seeds, like most other monsters drops, shares a drop rate with another material, so you may not have gotten enough to complete the quest.
If this is the case, fret not, as you can also find roper enemies spawning in areas near Messia 224. The first area you can find and farm Ropers is in Ulvhan Grotto, so you can always return there via a fast travel point to farm them.
However, if you rather continue to the next area, you can also find them in Rudhir Forest. That said, to farm either enemy, simply go through the process of killing every Roper you can find and then fast-traveling back to reset the monster spawns.
Once monster spawns are reset, repeat the process of killing all Ropers until you have around four Earth Seeds. When you get enough head back to the NPC in Messia 224 and turn the quest in to get a Lohikeitto Recipe, 700 Gald, 135 SP.
Check out some of our other Tales of Arise guides!