I've been reading up on a lot of Black Crusade rules lately, especially concerning all manner of psychic goodness, in preparation for a game that's due to be run with my group in the near future. It's an all Chaos Marine group, and I picked out a Thousand Sons Sorcerer, partly because they're one of my favourite traitor legions and partly because I've never played any of psychic characters in the other 40K games. Given how free-form character advancement is, I decided to leaf through some of the books and decide what sort of direction I'd like to take the character.

It's around this point I found a rather nasty combo, which I was hoping I could get some clarification on (I've glanced through the last few pages worth of topics and found nothing specifically mentioning it). It goes as follows;

- The Thousand Sons Sorcerer starts with a force weapon, which adds the users Psy Rating to damage and pen.

- Making the weapon a Legacy weapon grants it additional bonuses, as well as adding the user's Infamy Bonus (rounded up) to damage and pen.

- The Legacy Force Weapon can then be used to create a Daemon Weapon, which in turn adds the Willpower Bonus of the bound Daemon to, you guessed it, damage and pen.

I'm well aware that there's plenty of complications to actually creating such a weapon, not to mention the fact that the GM might just outright deny it on general principles of power-balance, but I'm just trying to confirm whether the combination is actually rules legal, as I've seen nothing that says you can't do it. It's obviously appealing on the grounds of having a weapon that could probably quite easily slice through heavy tank armour, but I'm not sure it'd be worth the heat the GM would likely bring down on me, so lets call it an intellectual exercise for now.

Oh, as a slight aside, does anyone know if a Tzeentchian Daemon Weapon with the Force quality and the Sorcerous Power ability gets to use both in the same hit, as the Killing Will ability on the sword is a Free Action and Sorcerous Power just states it activates after dealing damage without any action required on the character's part?

No you are correct. Any weapon can be made under Tome of Blood into a Legacy weapon as you forge a name for yourself with it. Make it Best Quality for extra bonus. Tome of Blood also mentions you can use Core Rulebook and allows you to bind a daemon into it and explicitly mentions that in a sidebar stating that only the brave or foolish can then go bind a daemon.

So is it possible, yes.

Is it potent as hell, yes.

Would I allow it as a GM, yes but the risks and preparation would be stupid. Screw up and I would bring the warp itself down on you.

The issue is that if it is strong enough you would need to use silly numbers of tests when hit. Indeed I worked one out and some required several rolls on hit. Some to resist fire, resist stat damage, resist being vaporised...

Legal but can be immersion breaking.

The rolls to make such a weapon would be rough to say the least.

I would allow it based on the principle that you're likely not gonna roll well enough to actually get it, or you're gonna spend a lot of time in-game just getting it.

So by luck or fate, yeah, sure. Why not? It's still not a daemonic lascannon weapon-arm.

Yes, technically, this combination works. Take a look at Tome of Blood page 59 why it might not be such a great idea, though: Whenever you normally make a test for Daemonic Mastery, you also make an Elevation test (which is an Infamy test at -60 for this baby) and vice versa. If one fails, the other automatically does too.

I think creating this weapon with the intent of wielding it yourself might seriously contest Ahriman's little cantrip for "greatest sorcerous mistake ever made". Do the Thousand Sons have some kind of trophy for that?

I think creating this weapon with the intent of wielding it yourself might seriously contest Ahriman's little cantrip for "greatest sorcerous mistake ever made". Do the Thousand Sons have some kind of trophy for that?

Yep, and surprisingly nobody has ever received it. Any winners of this trophy mysteriously died when Ahriman offered them it in person.

Don't forget to add in unnatural WP to the demon you're binding. Increased demon weapon powers without the increase in demonic test (though woe to you if he ever actually rolls under his normal wp).

I somewhat love these rules. They are just another case off: Player brings his own doom upon himself.

And you, as the gm, have nothing to do with it, besides playing the consequences of his greed.^^

As others have said previously, yes it's possible. While I'd probably make my starting Force Sword into a Legacy weapon (trading in starting acquisitions), I'd never make a Legacy Weapon into a Daemon Weapon. The risks and potential penalties is just horrible, especially the higher acquisition modifier the weapon has (in the case of force weapons, high as hell), as you've got to roll both a daemonic mastery test as well as an elevation test when needing to roll either (the most obvious time would be whenever you was stunned and triggered a daemonic mastery test).