starting at Tier 2 for high zombie counts and special loot rewards. Spear Strategy
For a formal "paper" or full technical breakdown, the most authoritative sources are the official developer logs: Patch Notes : Detailed lists of every change are hosted on the SteamDB Patch Notes Official 7 Days to Die Website Community Wikis 7 Days to Die Wiki 7 days to die alpha 211b16 gamedrive verified