Wear the Cape of Balie's Organization and now go to coordinate F4 and enter the cave and find the [NPC]Suspicious Balie's Organization. Talk and now you will receive Joan's Research Findings
If you are dead on Joan's Test, go back to [NPC]Enoch to receive the Suspicious Rock again and talk to [NPC]Panhandler again you will be warped into Test Area
Post Sage Tower Renewal, you are no longer able to enter cave once you already entered Sage Tower through Archmage Iruel on Elim which makes you stuck in doing the quest. Therefore, you will not be eligible officially to complete Chapter 2 Quest.