Enjoy it while it lasts @WWERomanReigns. Keep the throne warm.

— Seth Rollins (@WWERollins) December 15, 2015

Roman Reigns' WWE World Heavyweight Championship reign has barely even begun, but Seth Rollins has already chimed in on his former Shield brother's long-gestating ascent to the supreme prize. The Architect, who was slated to defend the title against Reigns at Survivor Series before an injury took him out of action, sent an ominous tweet to The Big Dog that wasn't so much of a congratulations as a warning of things to come, imploring Reigns to enjoy the title "while it lasts" and to "keep the throne warm" until Rollins returns.

It would appear that the former champion has no intention of letting the Roman Empire rule unchecked. For what it's worth, the newly deposed champion Sheamus has chimed in as well.

NO. NO. NO. NOT OVER. How can a FORMER @WWE employee hold the #WWETitle? #FiredinPhilly

— Sheamus (@WWESheamus) December 15, 2015

Enemies on all sides and the prize within his grasp. Welcome to the mountaintop, Roman Reigns.