A gacha event mixing free grinding and paid gem spending. You collect key fragments (upper/middle/lower) and repair tools by hunting monsters (up to 80/day) and gathering resources (up to 20/day) -- ~100 fragments/day cap, FREE. Repaired keys open Cleopatra's Treasure Chest: each open costs Gems and is capped at 150/day. The chest is a gamble -- high-chance small sub-chests (resources, EXP, medals, runestones, stamina), low-chance jackpots 5K Gems, 2,500 Runestone Chest, or the highlight Epic/Golden Historic General (Premium, not at tavern). Gem cost per open rises every 10 opens (1-10 = 1,600 each up to 91-150 = 9,500; totals 16,000 for 10x, 139,000 for 50x, 970,000 for 150x). NOT reliably F2P for the general -- the author spent 120,000 gems without winning (luck-based, effectively a coining ranking). Ranking rewards come from a score accrued by collecting fragments and repairing keys. F2P value path: leftover fragments/keys auto-disappear after the event, so DISASSEMBLE them -- each fragment/tool = 2 Super Resources Chests (Gold); a repaired key gives only 2 keys, so don't repair if disassembling. At ~100/day free over 10 days = ~1,000 fragments = ~2,000 Super Resource Chests ~= ~120M of each resource. For a bot: grind fragments via monster-hunt/gather (both normal actions), then disassemble for resources rather than paying to open.
Original research source: Evony Guide Wiki