Ambush Scarabs of Discernment increase the likelihood of Path of exile currency Strongboxes being of higher or rare varieties, such as Diviners Strongboxes. Using multiple types of Ambush Scarabs can result in opening around 40-50 Strongboxes in a single map. Combining this with the Ambush crafting option in the map device and notable atlas passives like Secret Compartments can further enhance the effectiveness of this strategy. This approach allows for additional league mechanics to be incorporated into your atlas.

Gilded Legion Scarabs are highly sought after due to their ability to spawn multiple Legion encounters in a single map. Legion encounters can yield significant rewards, including Splinters and Emblems, which are valuable for both currency and crafting. This Scarab is particularly effective when combined with atlas passives that enhance Legion encounters.

Rusted Breach Scarabs increase the number of Breaches in a map, making them a popular choice for farming Breach Splinters and Breachstones. These Scarabs are relatively inexpensive and can be highly effective when used with atlas passives that enhance Breach mechanics, leading to substantial loot drops.

Polished Harbinger Scarabs enhance the number and quality of Harbinger encounters on a map, making them excellent for farming Harbinger currency and unique items. Harbingers can drop valuable currency shards, including Exalted Shards and Ancient Shards, making this Scarab a profitable addition to any farming strategy.

Choosing the best Scarabs for farming in Path of Exile depends on your specific goals, build, and market conditions. The Scarabs listed above are consistently effective in maximizing your farming potential, providing significant returns on investment. Experiment with different combinations and atlas passives to POE currency buy find the most lucrative farming strategies for your play style.