The map is very large, designed for 8 players. It consists of islands connected by small passages that are completely filled with level 7 monsters. From each island, a road leads to the center of the map, where there is an entrance to the Dungeon, and inside lies a sphere containing an army of 400 Archangels, 400 Archdevils, 400 Titans, 400 Black Dragons, 400 Gold Dragons, and 500 Hydras, Phoenixes, and Behemoths each. In the Dungeon, there is a prison where a hero with level 40+ is guarded by about 1000 Archdevils. The hero has the complete artifact set, Alliance of Angels (Sword of Justice, Shield of Lion's Courage, Sandals of the Saints, Helmet of Divine Enlightenment).

Added 4 minutes later
I remembered something else. Near each island, there is a small islet with an Eye that surveys the map. Each Eye is guarded by a Legion of Evil Eyes; when attacked, they always offer to surrender if the attacker has a large army. There are about 20,000 Evil Eyes in total on the map.

Added 10 hours 58 minutes later
I found it! The map is a standard map from "The Breath of Death." The ultimate Fight.