ErrinF created the greatest dominion expansion of all time. Don't believe me? Here is the water-tight proof.

Let S be the sentence, 'if S is true, ErrinF created the greatest dominion expansion of all time'

Suppose S is true. Then the above is true, i.e., it's true that, 'if S is true, ErrinF created the greatest dominion expansion of all time' -- and since S is, in fact, true, that means ErrinF created the greatest dominion expansion of all time.

Thus we have shown that, if S is true, ErrinF created the greatest dominion expansion of all time.

Since the above sentence is precisely S, that means we have shown that S is true -- without assuming anything.

As shown above, this means that ErrinF created the greatest dominion expansion of all time.