NPC/A8/HB5

Making Ballista requires Archery level 6, but getting to level 8 is relatively easy and short. Most players will have horseback up to 8 in order to make cataphract. So A8/HB5 is a good entry-level stage for many. With these, you can farm NPCs up to level 4 without losses. To farm NPC at levels 5, you will need to increase Horseback riding (to level 8, some say). Your Logistics need only be 1, but getting from level 1 to level 7 takes only 2 days. The table below is for heroes with attacks (Atk) of 20, 52, and 71.