The best place to farm Plans: Dark Iron Mail is Blackrock Depths, where Blacksmithing Plans holds it at 38.7%. That is the vanilla 1.12 chance, not yet confirmed in Forever. 9 sources are ranked below by drop chance.
Best zones:
All sources, by drop chance:
| Source | Level | Zone | Spawns | Side | How | Drop% | Map |
|---|---|---|---|---|---|---|---|
| Blacksmithing Plans | Blackrock Depths | 4 | Contains | 38.7% | map | ||
| Molten War Golem(elite) | 55-56+ | Blackrock Depths | 6 | Drop | 0.1% | map | |
| Wrath Hammer Construct(elite) | 55-56+ | Blackrock Depths | 3 | Drop | 0.1% | map | |
| Ragereaver Golem(elite) | 54-55+ | Blackrock Depths | 4 | Drop | 0.1% | map | |
| Doomforge Arcanasmith | 54-55 | Blackrock Depths | 24 | Drop | 0.0% | map | |
| Anvilrage Marshal(elite) | 54-55+ | Blackrock Depths | 12 | Drop | 0.0% | map | |
| Doomforge Dragoon(elite) | 54-55+ | Blackrock Depths | 16 | Drop | 0.0% | map | |
| Fireguard Destroyer(elite) | 54-56+ | Blackrock Depths | 45 | Drop | 0.0% | map | |
| Weapon Technician | 54-56 | Blackrock Depths | 21 | Drop | 0.0% | map |
Drop% is the rate recorded in Forever once a source has been looted ten times; a greyed figure is the vanilla 1.12 chance from the world data (classic data: from the patch 1.12 world data, not yet confirmed in forever). Spawns counts the source's spawn points in the world data. "Side" names which side can kill the NPC when the other finds it friendly. The lead picks the best chance among sources that are not a rare spawn and have at least three spawn points.