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LK runs in single player, short and simple:
1 - get a fast character, preferrably a sorc with good FRW and FCR
2 - get to Hell difficulty, act 3, and aquire the LK waypoint.
3 - Uncover all of LK, check if there are two bonfires
4 - If there's only one bonfire, it's not a good map, so create a game on normal or nightmare to reset the map on hell.
5 - repeat steps 3 and 4 until you have a map where there are two bonfires fairly close to the WP.
6 - Do /players8 command and start running like this:
A - You start in act 3, which is a long run, so put on all your FRW
B - Run to the WP (you can grab it with telekinesis if you're a sorc) and goto LK
C - Run/Tele to the two houses by the first bonfire. Pop all three chests inside them. There is a weapon rack inside the small house, and an armor rack just north of the larger house. Depending on the route you take to them, these may or may not drop the same base item fairly steadily.
D - Repeat step C for the second bonfire. When the last chest is popped, save and exit.
Tips:
- MF has no effect on superchests and racks, so lose it and get FCR/FRW gear instead.
- Don't bother killing monsters. Lose all your damage/+skills for more FCR and FRW (and survivability gear if that's an issue).
- A merc with "hit causes monster to flee" gear can be great, if a nasty boss pack is camping the house where you just popped a nice rune from a chest. Necros and barbs can use terror/howl for the same effect.
- Don't pop objects other than the superchests. Only exception is the occational rack which could lock onto a nice base item (Dusk Shroud, Colossus Voulge, etc).
- Don't give up rerolling your map if it's not good. Those 5 seconds extra each run quickly adds up if you're doing a decent amount of runs (decent amount being a few thousand runs).