Midgardsomr and the Sundering (Spoilers)

[Enkidoh]

In the context of the game, when someone refers to 'this star', it actually means planet or world, not a sun/ball of gaseous plasma undergoing nuclear fusion reactions (this pops up quite commonly in manga and anime, which I understand is due to the Japanese language not having a specific word for 'planet', instead using a word commonly translated as 'star', but I dropped out of my Japanese language class so someone far more knowledgable on the subject would be better able to clarify or deny that).

Either way, the Sundering only resulted in Hydaelyn the world being split into the Source and 13 shards. The dragons were not sundered because they are not native to Hydaelyn and arrived on the Source long after the Sundering occurred.