Many wondrous items and other equipment duplicate spell effects, typically at the Caster Level the item itself. I would be interested in making a character that used their own HD/Class Level/Caster Level in place of such magic items.
One example:
Mask of the Skull, 1/day CL 13 effect of Finger of Death. I think a really cool build would allow me to use this (and other 1-3 use per day magic items) at my current character level, so that at 15th level, Mask of the Skull would do 150 damage or save for 3d6+15.
Ideally, this would be a non-caster type because otherwise I'd just as likely make a Wizard with Staff-Like Wand. I'm not looking for tons of magical spellcasting, but to actually benefit more than just minimum CL items (without dealing with getting a GM to allow me to pay more for higher CL Wondrous Items).
Paizo material preferred, 3pp content allowed, no 3.5.
Best Answer
The Arcane Savant can do this.
The Arcane Savant is a prestige class that focuses on getting the most from magic items.
At 3rd level, they can use their caster level on spells they cast using scrolls and wands.
Since the Arcane Savant prestige class requires 5 hit dice as part of its prerequisites, the earliest a character can gain the Scroll Master ability is at 8 hit dice. This is faster than the Magician bard archetype, who gains a similar benefit at 10 (or more) hit dice.
At 10th level, the Arcane Savant gains their capstone ability, and can use their caster level for any single magic item.
Note that the Arcane Savant is behind one caster level, although you can use the Magical Knack trait to compensate. So if you multiclass Wizard 5 / Arcane Savant 10, then you could use a Mask of the Skull's effects at 15th level, as you described.