She fails to notice the trick.

And so, slowly and with a lot caution, Thomas managed to apply the dissolvent to Rhea's dress, by using an special telekinesis spell that allowed him to silently spray her, droplet by droplet, by moving the liquid inside the jar towards her. By the time he was finished, all of her dress had been covered in a very thin cape of dissolvent and she hadn't even noticed.

"Well, how do you like the podium your holyness ?", asked Thomas as he finished.

"It's great, i like the colors and the design", she replied, "Though, for some reason, it gives a somewhat wet feeling when you are near it", she added.

"Well..., it's just that the paint it's still pretty fresh, that's all", Thomas replied in a masterfit of improvisation, for she did not only buy the lie, but also abstained of making further questions.

"Alright, i guess i should let it dry before the ceremony", Rhea simpley replied, "Well, good job with the construction, see you at the ceremony", she also said, upon which, she and her guards left the room to attend other matters, leaving Thomas alone to comtemplate his victory.

"YES!!", exclamed Thomas out of joy, for the plan had all gone to perfection, the archbishop's dress was now covered in the dissolvent, and according to his calculations, it would be only a couple of hours before it vanishes completely. Right in the middle of one of the biggest ceremonies that Fódlan had ever seen.

And the best of all of this, is that he would be getting a front row seat to witness the ensuing chaos, And it will be glorious!. All that he had to do now, was to wait for that moment.