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[WOTC] Mindshields Grant Resistance, Not Immunity

Mindshields no longer make the wearer immune to psionic afflictions. Instead, they grant the soldier +75 to Will saves against these effects.

The formula for psionic stat contests is as follows:

Hit% = Base Accuracy + Attacker Psi Offense - Target Will

Base Accuracy is 75 for enemy psi skills, so the Mindshield cancels that out. Mindshields are still very good insurance against getting mind controlled, but low-Will soldiers will be at risk.

Avatars have an astronomically high Psi Offense value of 200, making their Mind Control effectively impossible to resist without immunity. (The Warlock caps out at 60.) I've included an optional rebalance in this mod's config files that takes them down to a reasonable 75. To enable it, navigate here and uncomment the indicated lines: C:\Program Files (x86)\Steam\steamapps\workshop\content\268500\2442052832\Config\XComGameData_CharacterStats

Sectoids are another outlier at 90 psi offense, so they will still have a good hit rate with Mindspin, but Mindshield resistance also factors into the ability's secondary effect roll, so the chance for the Mind Control outcome is greatly diminished. By contrast, Advent Priests only have 40 psi offense, so they will miss much more often when trying to set Mind Control directly.

If you're playing with A Better Chosen, you'll want to comment out the following line in XComGameData_SoldierSkills.ini: DetonateMindshieldAbilities="MindShield". Otherwise, the Warlock will ignore Mindshielded soldiers as potential affliction targets.