KE (Kill Event) = the 'Kill Enemies' stage, the final stage of the 'Monarch Competition' event (5 stages solo; the cross-server 'Server Monarch Competition' has 6 stages with stage 6 = Kill Enemies). It is distinct from 'Server War' (SvS): Server War scores purely by how many enemy soldiers you defeat on enemy servers, whereas KE/Kill-Enemies also has other scoring paths. Reward = a 3-level quota scaled to the player's level (low-level players can still achieve it) and the reward contents scale with level. Example for Keep 27: quota-1 = Troop March Speedup x3 + 10-Stamina x3 + 30min Heal Speedup x2; quota-2 = Adv City Teleporter x2 + Research Stone x5 + 30min Training Speedup x2; quota-3 = 1,770 Gems + Refining Stone x25 + 100 Chips.
Original research source: Evony Guide Wiki