In Cape Oath, you can find a time tunnel that warps you to Musk Reef. To access the time tunnel, one must collect the seelie in the area surrounding the Electro slimes. This will then create an air current that will allow one to ride up to the time tunnel. While the time tunnel does not appear on the World Map, it will appear on the minimap upon approaching its vicinity.
|Electro Crystal||✘||Found near the Electro slimes|