The legendariest sword of most legend: Stacking maximum awesome on a single weapon

[Flickerdart]

In the spirit of the Supermount, how juiced up can we get a weapon? I've already done a build for getting +loads on a weapon you pull from your butt (or your mind, let's not split hairs) but how much can we stuff into a weapon that already exists and is just brimming with ridiculous amounts of legendary power that you must awaken? Let's say that for the purposes of the challenge, anything that's external to the actual legendary weapon of legend (like fiends of possession) shouldn't count, since it's not really part of the weapon...unless of course you can figure out how to trap the fiend inside the blade and forcibly keep the bonus!

The obvious starting point seems to be a Legacy Weapon that is simultaneously an Ancestral Relic, Intelligent Item, an Item Familiar, and a Legendary Weapon (using Legacy Champion to advance your Scion class). Is there anything more that can be done?

[Dusk Eclipse]

Could you fit in Kensai levels or would it count as separate and/or redundant?

[Biffoniacus_Furiou]

Remove Ancestral Relic, it will only limit the total value of the weapon.

You should probably make it an Elvencraft Composite Longbow, so it counts as (and can be upgraded as) three weapons at once. Put three Wand Chambers on it just for kicks.

As an Item Familiar (http://www.d20srd.org/srd/variant/magic/itemFamiliars.htm) it's already an intelligent item, and you can upgrade it yourself as though you possessed all the proper item creation feats. This is probably the best possible start.

An Item Familiar can be given lesser and greater powers via leveling up and paying full price for them, but this is only one of several ways to add special intelligent item abilities to it. The one to focus on is the standard item creation rules, namely those that govern upgrading existing items. RAW: A creator can add new magical abilities to a magic item with no restrictions. (http://www.d20srd.org/srd/magicItems/creatingMagicItems.htm#addingNewAbilities) That means you can use the normal magic item creation rules to add as many lesser powers, greater powers, and even special purpose dedicated powers as you want to it, provided you meet the prerequisites (you don't need the item creation feats) and can pay half the base price in gp and 1/25 the base price in xp.

Since the base item is an Elvencraft Composite Longbow, it counts as a quarterstaff. You can add charges of spells to it as though you possess the Craft Staff feat, in addition to making it a magical weapon. This would actually be the only reason to make it an Ancestral Relic, since you could cast Stone to Flesh and then Flesh to Salt on a boulder and then sacrifice your 5 gp per pound (http://www.d20srd.org/srd/equipment/wealthAndMoney.htm#wealthOtherThanCoins) boulder of salt into the relic to make it a Staff of Wish or similar, basically gaining free wishes. You could actually take Ancestral Relic for a separate item, and use this trick to use the function of Wish to "create a magic item, or add to the powers of an existing magic item" to upgrade your intelligent item for free.

[Sagetim]

I think the Rokugan/Oriental Adventures Samurai bears mentioning, because it gets a daisho that it can upgrade by prayer for free. The Oriental Adventures one just pays money, so if you could get your shugenja to take you to the shadow plane and build an altar to your ancestors there, you could use it to pray your sword into being Shadow Striking (from Tome of Magic). This +3 ability allows your weapon to count as anything it needs to to beat DR after the first hit. Though it only counts as one thing at a time (so beating a lich makes it able to bypass lich dr, but when you hit a werewolf, it switches to what's needed to beat werewolves, etc). The effect lasts a few minutes after your last hit on something that requires that material, but it's super useful for keeping your one weapon effective.

This is assuming you're not using sword sage or w/e for mountain hammer and all that jazz. But you want a Weapon of Power, not a Guy of Power. +5, sacred, ghost touch can round out the rest of the special abilities on your weapon, making it strike as good and whatever material it needs to, as well as hitting ghosts. Since Iajutsu Focus never mentions itself as being precision damage or anything like that, you can assume that it will be effective on any target that you can force to be flat footed as you draw the blade and hit them with it. Since you have to have at least one level of samurai to work this particular build, it's safe to assume that you're going to get iajutsu focus. With Item familiar, be it the sword or something else, you can keep pumping your iajutsu focus even if you abandon the samurai class after that point. As long as you remain honorable, you keep your enchanted sword, and your character level, not samurai level, determines your ability to enchant it with prayer.

Using the salt trick that Biffoniacus mentioned would ensure that you don't run out of money for your shenanigans beyond this point, but with what I've described you could have a weapon that you can one shot anything that comes your way, especially with sapphire nightmare blade from sword sage (or even just a feat for that one maneuver). Iajutsu Master would help complete this riduclouslenss, but that's more Character Power than Sword Power. Maybe you could train your now sentient sword to be an iajutsu master so that when it passes on to a new guy, it can take them over with it's massive ego and use them to enact it's honorable will.