#thrown weapons

First of all, the paragraph needs to be reorganized:

Whenever you have an ioun stone orbiting you (or implanted, for that matter), you bond with that stone. You lose your bond with any stone out of your possession after 24 hours. As a swift action, you may telekinetically recall into orbit one bonded stone within 20 feet per Sorcerer level. You treat ioun stones as thrown weapons with which you are proficient; they function as darts, but deal bludgeoning damage and count as magic for the purpose of overcoming damage reduction.

There we go: actions required before effects, passive abilities before active ones, generalities before specifics, normal rules before exceptions, and relevant tangents in parentheses.

Effectively, this gives you an ability slightly better than a cantrip, but in contradictory ways.

The first contradiction:

As a swift action, you may telekinetically recall into orbit one bonded stone within 20 feet per Sorcerer level.

Bonus Feats: Acrobatic, Craft Wondrous Item, Magical Aptitude, Quick Draw, Point-Blank Shot, Precise Shot, Skill Focus (Knowledge [history]), Throw Anything.

You won’t want to use Quick Draw (iterative attacks [like you have any] for thrown weapons) because of the action restriction. Now, the recall ability exists both for the attacking and to combat kleptos from yoinking your stones, so maybe that’s for balance. However, given the capstone power, I suspect it’s because someone thought returning (a +1 enchantment that makes thrown weapons work like how they say boomerangs do) would be too powerful for first level characters to have.

(<3 Bowie-sama.)

The second way it’s contradictory is in range. Most attack cantrips work at Close range (25 ft. + 5 ft./2 levels, meaning 25 to 75 ft.). Darts have five range increments of 20 ft., with a cumulative -2 penalty on increments two through five. Yes, your maximum range with recall becomes available at 5th level. However, you will always take a penalty to match the maximum range of the cantrip (even though you can exceed it). Further, since most attack cantrips use ranged touch attacks¹ and you still have to roll against armor, you’re not going to hit shit.

You are still better off with a crossbow, given that to use either you need to be within closing range of, say, an enemy Fighter. (I will make a big stink about this point when I review Reserve feats.)

So, onto the second question: how exactly are these

(DMG 3.0 and 3.5, but art with similarly sized stones exists all over.)

comparable to something like this?

The dart used in D&D/Pathfinder (pictured above: late Roman plumbata) is most closest to today’s lawn dart, not the tiny things used in the game of the same name (though they do descend from the military ones). The comparison this Bloodline uses is a bit of a misnomer chosen for the sake of mechanics.

See, darts are mechanically nearly identical to sling bullets:

One dart weighs 1/2 pound (in D&D, at least). Sling bullets come in groups of 10 and such a group weighs 5 lbs. Math: it’s what’s for dinner. (Bum bum bum.)

Both the dart and the sling deal 1d3 (Small) or 1d4 (Medium) damage.

Both have a crit of x2 with a normal crit range.

Both are simple weapons.

They vary in three respects: price (pft, we’re using magic items, which are loads more expensive than either), damage type (already accounted for), and range. As I explained above, slings have a range increment of 50 ft. (nice!), whereas darts have one of 20 (sad face!). So, the comparison is more to this:

Still, this seems off; ioun stones are usually shown to be really small, like pea-sized. Does any source (3.x, Pathfinder, fifth edition, something else) provide sizes to corroborate or contradict the art? Not that I could find.

Thus, I tracked down the stones’ origins: Jack Vance’s short story “Morreion,” coincidentally also about finding the sources of ioun IOUN stones. The ones in D&D are lifted from that (with Vance’s permission; yes, they are copyright Vance, not TSR/WotC/Hasbro or Paizo). It took me a while to acquire the story (I had to use the regional interlibrary loan consortium), but right there at the beginning of chapter 2 (of 41 pages²) was what I sought:

“each approximately the size of a small plum.”

A brief Wiki Walk told me that plums are about 2 to 7 cm (3/4″ to almost 3″); Google confirmed about 1-3″ plums.

How big is a sling bullet? Well, Wiki claims about 1″ in diameter, though they’re oblong. The key is that they’re often made of lead. Ioun stones don’t get weights, but that’s easily waived (or else presumed to be irrelevant because of telekinetic force).

So yes, this ability is reasonable in principle.

In application, could/should this have been better? In all ways, yes. I will give my version of how this should have worked come the end of the week.

Is it a bad Arcana? Not really; I’d give it a C+/B-, but mainly because of its interactions with your Bloodline Powers.

¹ The main exception to this is telekinetic projectile, which launches an item out to close range as a thrown weapon attack. The trade-off is that it deals 1d6 non-magical bludgeoning (regardless of what you throw) rather than 1d3 magic of an energy type. However, it’s an abomination for one reason: it also deals damage to the object thrown.

² Bear in mind the 41-page count while I explain some things - or, rather, go on a rant.

Jack Vance’s Dying Earth series is one of the primary sources used to develop Dungeons & Dragons - hence “Vancian casting” (and Vecna, an anagram and homage). Had he not inspired the casting system, we likely would have had a spontaneous arcanist from the beginning. (Psionics have been spontaneous since Eldritch Wizardry [OD&D Supplement III, 1976]; had they not earned a reputation for being broken af, the would-be Sorcerer of 3rd edition would likely have been a Psion instead.)

I say all of this because neither H.P. Lovecraft nor Gary Gygax, both noted for their use of strange words, hold a candle to Vance. So horrendous is his diction that it took me several days to get through those 41 pages.

Mind you, I have a Master’s in English with foci in literature (specifically Shakespeare) and linguistics; I’m used to word choices people don’t like and trained not to get annoyed by them.

This did.

It’s like he sat down with a thesaurus and consulted it for the least-used words he could find for every word in dialogue and many words in narration. On top of that, the plot didn’t make a lot of sense (there were lots of weird jumps in logic, in part because of the diction, but also just bizarre behavior). In the end, I felt I had wasted an interlibrary loan (What if I had accidentally damaged the book? I’d have lost ILL privileges on this tripe!) and a lot of reading time I could have put towards The Starless Sea (which is due sooner and has a line waiting for it, but I wanted to get this post done).

I cannot speak fairly of the Dying Earth series because I haven’t read enough of it, but the diction is something that Vance is noted for. I don’t want to write off Gygax’s tastes, but so many of the things I detest about D&D go back to his personal preferences, in particular Jack Vance. I’m unsure if I will try again another time because I think I’m being highly unfair, but seriously, I hated this.