To make the Treachery runeword in Diablo 2: Resurrected, you need a set of 3-socket body armor to use as a base. The lowest level 3-socket body armor is Light Plate, which starts dropping in Act III on Normal difficulty, although you might be able to get it earlier in the Secret Cow Level. You can also get a non-socketed set of Light Plate and add sockets using the Horadric Cube, or using Larzuk during Act V.
The Treachery runeword recipe, ‘ShaelThulLem’, only requires three runes, and they’re all fairly easy to find. The easiest to get is the Thul rune, which starts dropping during Act IV on Normal difficulty, and can be gotten from the Hellforge on Normal too. If you’d rather farm The Countess for it though, you’ll have to do so on Nightmare or Hell. The Shael rune starts dropping during Act V on Normal difficulty, and can be gotten from the Hellforge on Nightmare, or from The Countess on Nightmare and Hell. The Lem rune doesn’t start dropping until Act III on Nightmare, and you can get it from the Hellforge on Nightmare or Hell, and from The Countess on Hell only.
Remember that you have to insert the runes into the armor in the correct order. So the Shael rune, then the Thul rune, then the Lem rune. Once you’ve done that you’ll have a very powerful set of armor, considering the relatively low level of its ingredients. Treachery is especially good for Assassins, but works well for any Class thanks to the increased attack speed and ability to use Fade. Many players equip it to the Mercenary, because the increased attack speed makes them much more effective. Treachery’s bonuses are as follows:
- 5% Chance To Cast Level 15 Fade When Struck
- 25% Chance To Cast level 15 Venom On Striking
- +2 To Assassin Skills
- +45% Increased Attack Speed
- +20% Faster Hit Recovery
- Cold Resist +30%
- 50% Extra Gold From Monsters