Simple Q&A D&D 3.5 (by RAW) XXII

[Crake]

A 178: False. Hardness is determined by 2 things: the material, and the enchantment. The enchantment is simply the +X value. A Light shield +1 and a Light Shield +1 with every shield enchantment on it both have a hardness of 12, and 20hp, assuming steel The other enchantments do not affect the enchantment bonus in any way(other than making it more expensive to purchase more)

A178 clarification
While this answer is correct, some terminology was used wrongly.

The bonus to hardness and hit points is per enhancement bonus, not per enchantment bonus. The enhancement bonus is the +X part of the weapon. So no matter what other enchantments you put on it, the best bonus you can get from enchanting a weapon is +10 hardness and +50 hit points for a +5 weapon (until you go epic of course).

Q179
What happens to your level gained ability bump at levels divisible by 4 if you go down a level either from energy drain or death?

Edit: Found my answer in the dnd Glossary. It is lost, but if you can't remember which ability you bumped, you take it from your highest ability score.