Giant

Both Lumin and Void Goliaths speak Giant.   The ancient story that the elders tell their children is that many years ago, the Lumin and Void goliaths were one race living in the Lumin realm. Due to envy, a group of the goliath turned to dark powers to further their goals but they were exiled to the Void for their crimes.   The Void goliaths have a different version of the story. According to them, they were the innocent ones, and were framed for a crime they didn't commit, due to the jealousy of others.   Curiously, the language has a similar dialect to Earth's Norse languages. There are some theories on why this is the case, but no evidence has been found or supplied by either group to confirm any of them.