Mods / difficult

• AA Harder War: Advanced Aliensby ReshiKillimA Harder War: Advanced Aliens brings five dangerous new Alien variants, and a new SITREP. Muton Decurions Better trained, better armed, and possessing greator sensory faculties than the average Muton, Muton Decurions pose a significant danger to the soldiers of XCOM. Muton Velites Specially train...70.8k downloadsupdated 3 y ago
• [[WOTC] Muton Enemy Packby Alpha115This mod adds 6 new muton enemy variants, all the enemies in this mod are quite tough and can give you a fun challenge. there is 1 early game muton and several mid/late game mutons, and these mutons are affected by certain dark events. This mod is compatible with the muton elite mod, the muton ha...30.0k downloadsupdated 2 y ago
• [[WOTC] Advent Purge Unitby Alpha115Hi everyone, Alpha 115 here bringing you my next Enemy mod. This mod brings in some new units to boost up advent. The Advent Purge Unit is composed of various fire based enemy types. These enemy units focus on Burning all hostiles. The purge unit was originally made to destroy the lost but due to...27.3k downloadsupdated 5 mo ago
• AAlpha's Drones and Robotics packby Alpha115This mod adds a new robotic enemies the Advent Combat Drone and Combat Bot. I'm going to be adding more robotic enemies over time to the mod. The Advent combat drone has two weapons for a fight its stun taser or its shock gun. The drone also brings some utility to advent as it can repair robotic...11.4k downloadsupdated 15 mo ago

4 difficult mods, most downloaded first. Each one has its own page here with what it needs to run and where its author publishes it; the files themselves stay with the author and are never re-hosted on this site.