Lava isn't a defined type, but it's obviously very damaging to objects.
The default stats for a one handed blade are 10 hardness (derived from being steel) and 5 hit points (derived from being 1/6th an inch of steel).
An adamantine longsword will have 15 hardness and 7 hit points.

The sword took 7 points of lava damage. The question then is, how good is lava? My assumption at the time was that it completely ignored hardness, but that seems really unlikely to be correct.

Instead, we'll have lava quarter hardness, which is the 3.X value for really object-damaging energy types, such as sonic. This means that stabbing it with an adamantine object will be three less than the value rolled, and striking with an iron object would mean iron's hardness subtracts 2 from the damage dealt.

So presumably Ichabod's sword is at 4 hit points, not 1.

This also means that the sword does not have the broken ( https://www.d20pfsrd.com/gamemastering/ ... TOC-Broken ) condition yet. The reflective damage to the object and the melee attacker is 1d6, so a roll of 4 or better would give it the broken state (by dealing 1 point of damage, taking it to less than half), with a max roll reducing it to 1 hit point.

Note that objects that have the broken condition can still be repaired, either mundanely or with trivial magic, such as mending ( https://www.d20pfsrd.com/magic/all-spells/m/mending/ ), which restores 1d4 hit points per cast and can be spammed once per round when out of combat, assuming anyone knows it as a cantrip or orison.

Well, I found something that I couldn't find before. Perhaps I don't want to have found this as it may pertain to the robot swords.

"Each +1 of enhancement bonus adds 2 to the hardness of armor, a weapon, or a shield, and +10 to the item’s hit points."
https://www.d20pfsrd.com/equipment/damaging-objects/

So the real question here is whether a sword is magical because a tura gem is in it? Or is it that the tura gem is strong and has effects on the sword, but the sword itself is non-magical?

It's a question of 4/7 hp (I see you're rounding down a 3.75 to 3) or 15/17.

The next question is all about robots.

"So the real question here is whether a sword is magical because a tura gem is in it? Or is it that the tura gem is strong and has effects on the sword, but the sword itself is non-magical?"

The tura itself becomes stronger the more enchanted it becomes. I'm actually of the belief that the hitpoints grow so unreasonably high because the intention of Pathfinder is to not have magical weapons incidentally destroyed. It also serves as a substantial nerf to Sunder, which becomes a PC-versus-minor-NPC tool. I feel I've solved the problem of incidental good weapon destruction adequately for most cases with the Turas themselves. The sword is magical, of course, when enchanted by the Tura- it just doesn't go from 7 hitpoints to 37. It still strikes as a magic weapon, etc.

If you actually enchant a sword normally, which you totally can do, you'll get the listed pathfinder benefits, so someone with a +2 steel sword will have the hardness 14 and the 27 hit points. Of course, they won't have the extra d6 of elemental damage.

Also, as you've probably seen, there's a few custom weapons that have a passive "enchantment" ability that gives them +1/+1 even without a Tura in them. These weapons would use the Pathfinder rules for +1 weapons (+2 hardness, +10 hit points) whether they have a tura in them or not, and they benefit from Turas. There were a couple like this is the last campaign as well, but back then I would write them as some weapon, with abilities, at +whatever, with the caveat that a tura would override that. I guess you could go looking for a +3 adamantite sword that you then put a +3 equivalent Tura (say, +2 Pa) in, and have the benefits of the +3 equivalent Tura (+2/+2, 1d6 element, burst element on crit), while the sword has +6 hardness and +30 hit points (but doesn't gain the +3/+3 because the Tura overrides that). That seems a silly use of gold, but at some point the good guys usually end up with a silly amount of gold in E6.

You do realize I had to borrow a longbow, right?

Ah, the noble paladin, unsullied by the trivial monetary gains of mortal life.

Hey, 1ed had a 10% tithe, didn't it?

Also you are wearing a robot

#ThingsOnlyHeardInCaligo

I think it's more like carrying a friend.