Is Path of War compatible with Tome of Battle?

[atemu1234]

Or is it convertible? If so, how?

[Psyren]

I think your main concern would be mapping the disciplines. Beyond that, the lattice is there (strikes, stances, counters, boosts, discipline weapons, initiator level etc.)

[Elricaltovilla]

They can play nice together, although its probably easier to convert Bo9S to PoW than the reverse. Unfortunately, the classes in the Bo9S aren't going to measure up to the PoW classes. However, several of the disciplines do help fill niches that PoW is missing. In particular, if you take both Silver Crane and Devoted Spirit disciplines, you can actually make a pretty damn good healer using only maneuvers, and double dipping Golden Lion and White Raven will give you all kinds of ways to break the action economy and buff your allies.

[EisenKreutzer]

Are there some obvious, glaring balance issues with allowing ToB disciplines and/or PrC's in Pathfinder alongside the PoW material?

[Elricaltovilla]

Are there some obvious, glaring balance issues with allowing ToB disciplines and/or PrC's in Pathfinder alongside the PoW material?

Well there's Ruby Knight Vindicator's action economy cheese, but that already existed before Path of War. The only thing I think that should really be concerning is that Crusaders, Swordsages and Warblades are going to feel kind of empty compared to the plethora of class features and options Stalkers, Warders and Warlords have. The Path of War classes are a bit stronger, and their disciplines are better focused and more powerful in general than their equivalents in Bo9S. The key is to figure out which disciplines the Book of 9 Swords offers that fill niches that PoW disciplines don't.

[Manly Man]

They're sort-of compatible, but not entirely. As mentioned, the Book of Nine Swords offers a wider variety of niches to fill, and therefore has increased versatility, but the classes themselves don't have as many goodies. You might try giving them a few extra abilities, though, like having the Crusader's Smite function like the PF Paladin's, give them Improved Mettle at some point, and something to complement that rather crappy capstone. Maybe making it so that they choose one of their available disciplines, and they can use two strike maneuvers in one turn, regardless of initiation time? It would help fit the double stuff that the other two classes get (seriously, Stance Mastery is pretty much the best reason ever to go for Warblade 20).

But yeah, if the classes themselves are to be up to par with Path of War, then they'll need some more perks, although they do have more flexibility in terms of the roles they can fill with their maneuvers.