depends on what 'Spear" they are trying to refer to.

Could be a Spear of Light which often used for the story as the Warrior of Light's actions.

Oceans deep may refer to part of the theme for 4.0 refering to sea battle events for Ala Mhigo since one part we can see on the world map is that access to new continent for Future Expansions are all near the Ocean.