The Ancient Activation Stone was without Aether for so long that it lost its power. Atropos told you to seek out Fuchsia, the Walking Encyclopedia. Fuchsia said she didn't know how to restore it and recommended you meet Lugbug. When you went to Lugbug in Reshanta, he infused energy into the Activation Stone and said that you could use it now. You took the Activation Stone that Lugbug recharged back to Atropos.