While we're on the topic of artificers, of which I know precious little, how do they get 9th level spells/9th level spell effects? I don't recall it going up that high on their table (which doesn't mean anything, given I can get a mystic ranger and a chameleon to each cast 9th level spells).
for the purposes of qualifying for crafting prerequisites, their caster level is considered to be their artificer level + 2. Once they hit level 15 they are considered CL 17th and qualify for 9th level spells. They simply have to make the appropriate Use Magic Device check to emulate that caster level (DC 10 + caster level 17th = 37). If the item duplicates a spell effect (scroll, wand, etc), then it uses the artificers actual character level to determine level dependent effects (a 3rd level artificer would have a 3d6 fireball, or a Bands of Steel that lasts 3 rounds).
You might be thinking of their infusion table, which is their class "spell list" (things they don't have to make UMD checks for, if you will
), which only goes as high as level 6.
So if it costs you a 3rd level infusion to persist something from an eternal wand, does that mean you can't use the Metamagic spell trigger class feature with an item with insufficient charges remaining?
And I looked over Geomancer, admittedly briefly, and I'm not sure I follow. Versatility states they can mix and match parameters to gain the "maximum possible advantage" for his spells. Does that follow to include "this spell is now considered arcane since this item only holds arcane spells"? Sounds like that'd be DM fiat to me.
And yeah, Eternal wands are mentioned in ECS and MIC and both times it says arcane spell of 3rd level or lower, though ECS apparently has more restrictions including a maximum CL 6th.