HIA VR Upgrade Stages
Expert Challenge: Agent Core Skill materials
Choose the boss whose reward preview matches the Core Skill material needed by your Agent.
WHERE & HOW TO FARM
Expert Challenge: Agent Core Skill materials
HIA Club VR Training, Expert Challenge.
Before you go
- Unlock Expert Challenge in HIA Club VR Training.
- Check the Core Skill material required by the target Agent.
- Have Battery Charge available.
Farming steps
- Open the target Agent’s Core Skill upgrade screen and note the required material.
- Go to HIA Club VR Training and open Expert Challenge.
- Compare the reward preview for each named boss stage with the required item.
- Select the boss stage whose preview lists the matching material.
- Clear the encounter and claim its rewards.
- Recheck the Agent’s upgrade screen to see how much of the requirement remains.
- Repeat the same boss stage if that material is still needed.
- Different bosses have different material previews; match the item itself rather than choosing by difficulty or familiarity.
- Expert Challenge provides Core Skill materials, while Agent Promotion uses a separate Combat Simulation stage.
Repeat, collect and use
This is a repeatable Battery Charge farm. Repeat the matching boss stage as needed for the Agent’s planned Core Skill upgrade; there is no need to clear unrelated bosses for this target.
Common mistakes
- Choosing a boss based on its name or appearance; use the current reward preview to match the material.
- Confusing promotion seals with Core Skill materials; verify the upgrade screen’s item.
- Continuing after the planned upgrade is funded; review the next Core Skill node before spending more.
When to stop or switch
Stop when your stock covers the intended Core Skill upgrade or switch to another boss if a different Agent requires a different material.
Sources & fact checks
What you can get here
Open a guide to find other locations and see what the item is used for.