I am looking to find a weapon that fits all these requirements
1) Applies to the Banner of Ancient Kings
If mounted on a longspear or pole at least 8 feet in length
2) Has Reach
3) Can be Flurried with*
*Crusaders Flurry does not work for this build unfortunately
It is a lot to ask for and I am confident I will need to take Exotic Weapon Proficiency to make it work but we will see
Take a longspear, modify it with versatile design to be in the close weapon group, and it works with brawler's flurry as a martial weapon.
If it has to work with the monk's flurry in particular that's harder. I can't even see an exotic monk weapon which is also a polearm with reach. You'd have to do something tricky like gaining reach from a spell or magic item (the long arm spell or a lashing shadowcraft weapon?) and use a quarterstaff or something.
There're three monk weapons with reach (Double-chained Kama, Kusarigama, Kyoketsu Shoge), but all three are "thing-attached-to-a-rope/chain" type weapons.
Therefore the only way to flurry a fitting weapon is to use Ascetic Form with the Versatile Design modification. That's four feats (including one for proficiency), though.
What are you trying to do? Why does it have to be a reach weapon? And is this for cMonk (if yes, which archetype?) or unMonk?
Monk flurry only or would Brawler Flurry be acceptable? A Hynasi Brawler can flurry with improvised weapons - and Pole Trick allows a character to "treat a pole as an improvised weapon with the reach and trip special features".
I don't think Monk of the Empty Hand would get reach as their improvised weapon overwrites the object.
A Sohei of 6th level or higher, "may use flurry of blows and ki strike with any weapon in which he has weapon training."
A Tri-Point Double-Edged Sword has reach & while it doesn't have the "monk" quality it is in the Monk Fighter weapon group - so there's probably a way to get flurry with it.
What are you trying to do? Why does it have to be a reach weapon? And is this for cMonk (if yes, which archetype?) or unMonk?
It is for a Gestalt Devout Pilgrim Cleric and Sensei Monk who channels negative earth energy to create difficult terrain that he then gets to ignore himself. So it doesn't need Flurry but it needs to be able to use 'Insightful Strike'
A quarterstaff can be 8' long even for humans, is a monk weapon, and you can gain reach by buff (potion, plant/growth subdomain {Fandarra or the Green Mother qualify for negative earth & plant/growth}, duergar race) or magic item; it's that or the 4-feat progression Derklord mentions.
it doesn't need Flurry but it needs to be able to use 'Insightful Strike'
That does actually make it easier, because Insightful Strike is definitely an effect "that augment[s] an unarmed strike", and thus Ascetic Style is sufficient.
There might be an easier way, and that's using a non-monk weapon enchanted with Ki Focus. The enchantment is really vaguely written, but seeing as it works for the passive effects of Ki Pool, yet also on abilities not ki related (Stunning Fist), I think Ki Focus should make the weapon work with Insightful Strike, too.Alternatively, you could ask your GM if can use the Guided weapon enchantment, which is from Paizo but from their 3.5 days.
It'd probably be easier to get two extra arms to hold the standard, or get reach with your not-hands unarmed strikes, than to make a reach weapon with the monk quality.
A kasatha would do the trick.
it doesn't need Flurry but it needs to be able to use 'Insightful Strike'That does actually make it easier, because Insightful Strike is definitely an effect "that augment[s] an unarmed strike", and thus Ascetic Style is sufficient.
There might be an easier way, and that's using a non-monk weapon enchanted with Ki Focus. The enchantment is really vaguely written, but seeing as it works for the passive effects of Ki Pool, yet also on abilities not ki related (Stunning Fist), I think Ki Focus should make the weapon work with Insightful Strike, too.Alternatively, you could ask your GM if can use the Guided weapon enchantment, which is from Paizo but from their 3.5 days.
Would Ki Focus work when Insightful strike specifically calls out Unarmed and Monk Weapons?
Ki Focus uses a term not used anywhere else ("special ki attacks"), and then goes on to say "These attacks include the monk’s ki strike, quivering palm, and the Stunning Fist feat (including any condition that the monk can apply using this feat)." The word "includes" means this is a non-exhaustive list, so there must be other abilities not listed that the enchantment does allow the wielder to use the weapon with. However, the only way to figure out whether an ability qualifies is to make an educated guess based on the examples given.
The one common aspect of these exampels is that they're default (i.e. not selected) Monk class features. From the inclusion of Stunning Fist we know that the ability does not have to actually require ki or be ki related.
Ki Strike (that's what the game calls the passive effect of Ki Pool) says: "As long as he has at least 1 point in his ki pool, he can make a ki strike. At 4th level, ki strike allows his unarmed attacks to be treated as magic weapons for the purpose of overcoming damage reduction". Sensei's Insightful Strike says: "At 2nd level, a sensei may use his Wisdom bonus in lieu of his Strength or Dexterity on attack rolls and combat maneuver checks with unarmed strikes or monk weapons."
Mechanically, these abilities work virtually the same - they're passive effects that (if the player chooses to do so) apply to an unarmed strike the character makes. The only difference is that Insightful Strike can also allows to be applied to monk weapons, and that's exactly where the uncertainty lies: We don't know if Ki Focus works for stuff that can only be used with unarmed strikes. It's entire possible that this is the intend, as that would clearly exclude Flurry of Blows, something i presuem is not an ability that Ki Focus is supposed to work with. On the flip side, I'm also very sure that the enchantment does not apply the effects of the Unarmed Strike class feature (scaling damage etc.), which does only work for, well unarmed strikes, so putting the divide there isn't the answer to everything.
Sadly, I can give no definite answer. I think from a combination of balancing, flaver, and guessed intend, Insightful Strike should apply, but only the three examples given indubiously work with the enchantment.