5th Edition perhaps simply because it is the 5th PFH?
I think the pun that's it's the 5th PFH is obvious, but last two titles of PFH were tied to its content, though not necesarily patch's content. PFH3 was titled "A Most Noble Sacrifice" but it was the LARP thingy Larian did, and PFH4 was "Grimforge".
