What is LoD?

14-Lunatic Pandora->Terra Tower

15-Ifrit->Lavos

Itīs easy to understand how the Garden time travels.
The gauge seems to be made of a special material,crystal-like.It looks like a piece of the crystal pillar.It probably distorts gravity.
When it rotates,itīs field rotates also.According to Lucca,a rotation field enables time travel.