Thieves Codex

Summary

The Thieves Codex can be crafted with the Inscription skill
Players who are members of the Thieves Guild can utilize a Thieves Codex to supplement their thievery against Creatures (bonuses will not apply towards players)
To use a Thieves Codex players must have at least 80 Stealing and at least 80 in one of Snooping, Hiding, or Stealth
In order to make a pilfering or mugging attempt, players must have at least 80 Stealing and Snooping (or just Stealing if player has selected the Shadow Hands thief codex trait).

Video

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Players earn Thieves Codex Experience based on the Raw Gold (before bonuses) they acquire when making successful Pilfer and Mugging actions against creatures
When players earn enough Experience, they will earn a Thieves Codex Point they can spend towards upgrades
Players can Reset Spent Points for a Thieves Codex once every 5 minutes

If the player succeeds in Pilfering or Mugging a target, the player will receive some gold and potentially a Black Goods item in their backpack
Any Thieves Codex upgrades that are listed as working during/after a Pilfering/Mugging success will apply even if the target creature no longer has any Gold remaining for that player to steal

<b style="color: red;"><strong>NOTE: As of the Wildlands expansion Ruffian is no longer working with partial points -- you need maxxed Ruffian before you can drop Tactics. Partial points still work for Shadow Hands.</b>
Allows the player use their printed Stealth skill in place of Tactics skill when doing a Mugging attempt (Backstab + Stealing) and for 10 seconds afterwards
This upgrade effectively allows players to drop some amount of Tactics skill from their template, and use their Stealth skill in its place when making Mugging and for any melee weapon swings occurring for 10 seconds after the attempt
Note: this does *not* allow the player to combine their Stealth skill and Tactics together to go above 100 Tactics: they can simply use some amount of Stealth skill in place of printed Tactics

Examples:

Allows the player use their printed Hiding skill in place of Snooping skill when Pilfering or Mugging creatures
This upgrade effectively allows players to drop some amount of Snooping skill from their template, and use their Hiding skill in its place to making the Snooping skill checks needed to successfully do Pilfer or Mugging attempts on creatures
Note: this does *not* allow the player to combine their Snooping skill and Hiding together to go above 100 Snooping: they can simply use some amount of Hiding skill in place of Snooping

Examples:

A player with Ruffian Tier 1 could have 67 printed Tactics and utilize 33 Stealth skill to have an effective Tactics of 100 for Mugging + 10 seconds afterwards
A player with Ruffian Tier 2 could have 33 printed Tactics and utilize 67 Stealth skill to have an effective Tactics of 100 for Mugging + 10 seconds afterwards
A player with Ruffian Tier 3 could have 0 printed Tactics and utilize 100 Stealth skill to have an effective Tactics of 100 for Mugging + 10 seconds afterwards

A player with Shadow Hands Tier 1 could have 67 printed Snooping and utilize 33 Hiding skill to have an effective Snooping of 100 for Pilfering/Mugging
A player with Shadow Hands Tier 2 could have 33 printed Snooping and utilize 67 Hiding skill to have an effective Snooping of 100 for Pilfering/Mugging
A player with Shadow Hands Tier 3 could have 0 printed Snooping and utilize 100 Hiding skill to have an effective Snooping of 100 for Pilfering/Mugging