I'm going to suggest this as an explanation of who C is, and who is the Master.
When the pope proclaims "ex cathedra" - that is latin for "from the chair" - then he is supposedly proclaiming infallible teaching. It's supposed to come directly from God. This concept only became dogma in 1869-70, so it is a fairly new instruction, although the idea of papal infallibility had been floating about for some hundreds of year before this.
So, possibly, C, the Chair, refers to ex cathedra.
But the Vatican was dedicated to Lucifer (i.e. Satan) in 1963, when a black mass was performed in the bowels of the complex. (See Malachi Martin's teachings). So, the Master that directs ex cathedra teaching since then is not God, but Lucifer (the god of this world, for the time being).
Just as the faith of the Hebrews was co-opted by Satan's Synagogue - the Catholic hierarchy was co-opted as well.
I think it is important to discern between the bureaucracy of an organization, which can be corrupted, and the body of the organization, which are the common people that make up the true believers. It is no different from the general population here in the US that are good-hearted but misled. It's easy to hate them, but that's not we are being called to do. We are being called to rescue them.
The cabal hates them passionately. We should never be like the cabal, in any way. Pray for justice. Do not pray for slaughter, even of our enemies. Executions will occur. That doesn't mean we should glory in them. That is how HRC acted (we came, we saw, he died! HAHAHAHAHAHAHA). Don't be like her. Don't become her.
Be better than that.
For those atheistanons, the reality of this world is that religion is an organizational force in society. It is a tool, and like any tool can be used for good purposes or for evil. Kinda like "assault" weapons. You may hate it, but it is important to be unemotional in analysis, in order to avoid skewing your results through personal animus.
Your emotions can be manipulated, and the cabal has worked hard to master the tools to exploit this weakness in the human psyche. Warriors need to understand how their enemies work, if they wish to overcome them in battle.
And when the time is right, strike without mercy.