Conquer Online (CO) is a 2.5D/3D isometric MMORPG by TQ Digital (NetDragon), launched 2003 (China) / 2004 (Global). Still active with 15+ expansions.
Free-to-play, heavy Pay-to-Win. CPs (real money) buy best gear, refinement protection, EXP pots, VIP. F2P viable but slow; competitive play requires spending.
Community: Official forums, Discord, Reddit (r/ConquerOnline). Private servers exist (legality varies).