Final trigger that ended the Age of Gods(FS/N), World binding anchors beside Rhongomyniad So I am helping with providing ideas and checking for plotholes on FFN. The writer I am helping is planning on reintorducing the Age of Gods during the 5th Grail War so I need to know the original trigger that led to the end of the first one. I know that the barrier that seperates the Reverse side of the world where the gods/divine spirits and the general more OP beings of the Fate series reside is being maintained due to the exsistence of the real Rhongomyniad as a pillar of light that acts like an Anchor. Also are there any other anchors beside Rhongomyniad, if yes than what are they?
so I need to know the original trigger that led to the end of the first one


As indicated on the wikia under World > History > Age of Gods the transition of the Age of Gods (genesis) to the Age of Man (0AD) came in 3 phases


Deterioration


the Umbral Star passed by Earth allowing Sefar to invade in 12,000 BC, killing most sentient life, a large number of gods and plundering the vast majority of data from the Moon Cell

Separation


the weakened gods tried to create a link between them and humans by creating Gilgamesh, who ultimately rebelled and encouraged the complete separation of the gods and the humans
the gods ended up loosing their powers and became Divine Spirits
the decline of Mystery (which is how the world operated back then) is attributed to the demise of the King of Magic, Solomon

Trigger


in 700 BC, there is some unknown Trigger that caused the end of the Age of Gods (this has yet to be revealed)



so while the trigger to the very end of the age is not yet know it was probably some event which accelerated the age's end, however we can point to the fact that the Gods lost alot of power in the world after Sefar's invasion which lead to their downfall.

the page also lists an Age of Fairies which looks to be in between the Age of Gods and Age of Man but there is little information on this aside from the fact it has already ended, however given it's position between the 2 on the World page we might have a hint on when the Age of Fairies on the Rhongomyniad page


  Being the "king" that stood at the final moments of illusion and the Age of Gods, King Arthur possesses this Holy Lance that conceals such a tremendous power.


given that Vivian (the Lady of the Lake who gave Arthur/Arturia Excalibur) is a fairy we could speculate that Arthur's/Arturia's rule and legend is during the Age of Fairies




  Also are there any other anchors beside Rhongomyniad, if yes than what are they?


according to the wikia page on the Reverse Side of the World there may be


  Rhongomyniad is one of the "anchors" that fasten the planet together to ensure that the world of humans on the outermost layer of the world can't be destroyed by those on the Reverse Side who wish to reenact the Age of Gods.


Source: Reverse Side of the World (2nd Paragraph)

the use of the wording one of the "anchors" suggests to be there are more. however currently we don't know what the other anchors are or what form they take (or even if they are wielded in the world like Rhongomyniad with Arthur/Arturia and Grey)