Hyperfist said:
Question...does the Greater Magic Weapon stack with the weapons enhancement bonus or does it supplant it? And where is that listed. Thank you.
It's the basic principle of bonus stacking.
If I have a +2 Enhancement bonus to Strength from Gauntlets of Ogre Power, and a +4 Enhancement bonus to Strength from a Bull's Strength spell, that's not a single +6 Enhancement bonus; it's two Enhancement bonuses which both exist concurrently, and overlap. I get the +2 Enhancement bonus, but it has exactly the same effect as the first +2 of the +4 Enhancement bonus; in other words, the two together have the same effect as one would have. So in essence, only the larger bonus counts, and I gain +4 to my Strength.
Similarly, if I have a sword with a +2 Enhancement bonus, and I cast a Greater Magic Weapon spell on it, granting it a +3 Enhancement bonus, that doesn't create a single +5 Enhancement bonus; rather, it creates an independent Enhancement bonus that overlaps the existing one. A +2 Enhancement bonus and a +3 Enhancement bonus is an effective +3 Enhancement bonus.
Now, I personally subscribe to the reading that a Kensai is limited to imbuing a weapon up to a total market price modifier based on his class level - that is, a 3rd level Kensai with a +1 Flaming sword can make it +2 Flaming or +1 Flaming Keen, since that adds up to an effective +3 - his class level.
But let's say I agreed that he could
add an effective +3 to the weapon. If he adds an enhancement bonus, it will overlap with the existing enhancement bonus, not stack - that is, he could make his +1 Flaming sword a [+1] +3 Flaming sword, not a +4 Flaming sword. By adding a +3 Enhancement bonus, it doesn't add on top of the existing +1, but alongside it. His effectively-+2-weapon, by adding +3, has become an effectively-+4-weapon, not +5. On the other hand, since the +1 Flaming weapon already has an enhancement bonus, there's nothing (under the 'add +3' reading) preventing him adding +3 worth of special abilities - a +1 Flaming Keen Frost Shocking sword, perhaps - which gives him an effective +5.
Under this reading, as Zelc says, one might end up with an effective +20 weapon (+1 enhancement bonus, +9 in special abilities, and then add +10 in special abilities with Kensai levels) by Kensai level 10. The enhancement bonus is of course limited to +5, by the Kensai class description, but the special abilities are not so restricted.
But, as I say, I don't subscribe to this reading.
AS for the item becoming possibly a +10 weapon at 10th level. That is kind of crazy. But so is giving a 5th level character a +5 weapon.
Well, remember, Kensai is a Prestige class. So a 5th level Kensai, who has a +5 weapon, must also have at least 5 levels of other classes, since he needed a BAB of +5 before he entered the class.