The August 17 'Fuser Update' added a crafting station that combines ores into higher-tier Mega Ores. LDPlayer's guide is the cleanest description of the Fuser's role.
A YouTube walkthrough title mentions 51 pets; this count is single-source and labelled [INFERRED-FROM-COMMUNITY] until patch notes corroborate it.
The PETFUSION code (Devil's Growth Gem) was released alongside the patch to drive traffic to the new pet and fuser surfaces.
No public Roblox changelog was published; the wiki treats community observations as the most current source until Roblox or The Ore Drillers post an official note.