These three are major breaks which happened in the first, second, and third ages. There was also a second break in the first age I forgot about, the Battle of Night and Day.
The Sunstop was just as it sounds, the sun stopping in the heavens above the world, bringing back the Godtime. It was caused (like many magical disasters) by multiple people across the world. In Fronela wizards engaged in a magical contest with a pagan god, in Pamaltela the elves called upon a new god to cleanse them of a rot corrupting their bodies, in Kralorela the Emperor meditated upon the nature of existence, and in Dorastor the Second Council were creating Nysalor.
No one's sure how long it lasted (for obvious reasons), and some people claim time itself changed.
In the end, the sun was dragged back into movement by a net or web, and by a shadow that occluded it. It's also said that the sun has become weaker afterwards.
During the Battle of Night and Day when Orlanthi fought Orlanthi, for the soul of the world, when troll and dragonewt marched against dara happan and dwarf.
There Kyger Litor the troll mother appeared, and Nysalor revealed the new gods Tarumath and Daysenerus.
The second age's break was at the end of the war against the Zistorites, who used sorcery which may seem to be technology and vice versa.
In the end, the invading Heortlings summoned Orlanth himself to fight against Zistor the machine god.This one's the one I'm least convinced by. One, that Zistor's only an avatar. Two, it sounds more like regular heroforming to me.
The Battle of Castle Blue was the pivotal moment for the Red Goddess. She was still a mortal at this point, clad in human form, and liberating her people from the Carmanians. It was here she manifested her divinity, causing the Red Moon to rise from the ground, and fought Orlanth for the right to exist in the Middle Air.