Celestial Keys

Single Player / Co-op levels for Serious Sam - Second Encounter - Classic 

You arrive in a world, where empires of men serve as the battlefield of gods. Your mission is to retrieve the "Celestial Keys," two artifacts that are used to command the gods' will. Battle through the streets of Alansum and the royal gardens of Sehpsaheba, as Mental throws new challenges your way. 

9 levels with about 3 hours worth of gameplay and 3 new unique bosses. 

It uses Rakanishu's "Bestiary Minipack" and JesterOfDestiny's "Alpha Reimagined Enemy Pack" (version 2), along with music created by Valery "Senmuth" Androsov. Setting taken from "Project Celendiel" created by /u/Dravidistan on reddit. More credits and installation guide is included in the zip file.