行進
You may play a non-Duration Action card from your hand twice. Trash it. Gain an Action card costing exactly 1 Coin more than it.
Procession is an Action card from Dark Ages. It acts a bit like a combination of Throne Room and Upgrade, allowing you to play another Action twice and then trash it to gain a more expensive Action. This effect can be very powerful, improving your deck at the same time as granting you one last double-shot out of the Actions you trash to do so, but it's also quite risky since you very often don't ''want'' to use it on (and thus trash) your strongest Actions, the most obvious targets for Throne Room variants(Throne Room variant).