Question: xcom 2 how to train psi?
Answer: Step 1: Obtain a Sectoid Corpse. The Sectoids are the large, fleshy aliens with mental powers. ...  Step 2: Research - Sectoid Autopsy. ...  Step 3: Research - Psionics. ...  Step 4: Build the Psi Lab. ...  Step 5: Train a Rookie to Become a Psi Operative.