Ironic.
Gae Bulg was a spear of thorns that while launched with the foot while standing in a river (not joking) would branch out upon piercing a foe and wreck their body from the inside.
It was NOT a lance. And it didn't have homing magic. The homing spear was Ariadbhar, which belonged to Lugh, funnily enough, and wasn't a lance either.
None of them were lances as shown because the Myth Cycle was in Pre-Roman Ireland, and the Ulster Cycle was in the 1st century AD, both of which were well before the invention of jousting lances with the vamplate indicated.
Does Japan not have a word distinction between "spear" and "lance" or something?