A hex with a icon is an explorable hex if the following conditions are true:

• It is an edge hex, which means at least 1 of its edges is not shared with another tile.

• It is not already explored. A hex is explored if it is adjacent to a hex on another tile. Note that certain effects can cause tiles to be removed so that a previously explored hex is explorable again.

• Not all skyshards have been drawn for the current encounter. After all skyshards are drawn for a delve, that delve is fully explored. A hex is explorable whether it is occupied or not.