Bullgrit said:
Sounds like an old-school practice of having like "+1 to hit, +3 damage" magic weapons. But still doesn't make sense to me. This is a concept out of Weapons of Legacy?
It is; it may seem odd, but it provides an easy mechanic for what can be a wide range of item abilities.
Consider:
Legacy Holy Avenger: +5 holy cold iron longsword, area greater dispel magic at will, heal self 1/day, break enchantment 1/day. SR 5+paladin level.
Penalties: -2 attacks, -3 saves, 16 hp loss.
Ritual Cost: 55,000 gp
Flamecaster's Bolt: +4 seeking flaming light crossbow, faerie fire at will, bless 1/day, fireball 1/day, +6 Dex, endure heat, DR 10/magic against ranged weapons, plus another ability.
Penalties: -2 attacks, -3 saves, 16 hp loss.
Ritual Cost: 55,000 gp
Caput Mortuum: +5 unholy vicious wounding scythe
Penalties: -1 attacks, 12 hp loss, one 8th level spell slot loss
Ritual Cost: 52,000 gp
There are several standard penalty tables, and they also allow you to create your own levelled items from a menu of options.
Cheers!