Fae subjugation magic? The hell if Celestia doing reading between the lines to get to the point of how to set up the ward and not even knowing what id does?

Using smoke and mirrors to warp the dragons perception of the world and mind control. Celestia is either A more inept then in the show, B throwing thing's at the wall and hopping they stick or C evil .

Not evil evil but evil in she's trying to craft her perfect dragon my any means shy of sacrificing a goat... that's a bit darker seeing as they are sepiant here