History of Sync Plates

Overview

Sync Plates are Vex floor plates in the Vault of Glass Gatekeepers encounter. Standing on one opens a portal: left to the past (Mars) and right to the future (Venus), per PCGamesN.

Mechanic

Praetorians spawn and try to recapture plates; a Praetorian on a plate turns it red and closes its portal, and a red Oracle then spawns that can wipe the team if not destroyed. The usual advice is to keep three players defending and send three through to kill the Gatekeeper. Other searched coverage describes a different "five minute spire" version of the mechanic, probably another encounter or an older version; this page only vouches for the Gatekeepers description.