- Training: Identified Kaiju Neutralization — The main source. Up to 5 times per week at 0 stamina cost. Never skip your weekly clears.
- Encounter Stone Shop — Available monthly with an exchange limit. Priority should go to higher-value items like Gacha Tickets and Kaiju Core Materials first.
Tip: Exploit Medals are rare — always collect your weekly Training rewards and check the Encounter Stone Shop monthly. Prioritize medals for the characters you use most.