Yeah But Thief Skills...

My current thinking for Doomslakers B/X Thieves is to keep to the original class but grant substantial perks based on Guild affiliation.

But I may also include an optional rule that I also quite like (and probably would use more, if I'm being honest).

Ability Check Thief Skills

All Thief skills are based on Ability checks. Each skill is linked to a particular Ability score. Dexterity is very important, but other Abilities also come into play. If two Abilities are listed, then the Thief must pass a check on both in order to be successful. If a choice is given, the player chooses which Ability to use (this decision is permanent).

Open Locks (Dex, Wis)

Remove Traps (Dex, Wis)

Pick Pockets (Dex, [Wis])*

Move Silently (Dex)

Climb Sheer Surfaces (Dex or Str)

Hide in Shadows (Dex)

Hear Noise (Wis)

Disguise (Cha, [Wis])*

Evade (Dex)

Forgery (Int)

Read Lang (Int)

Use Scrolls (Int)

Poison (Int, Con)

Mimicry (Cha)

*If the target’s level is higher than the Thief’s level, the Thief must also pass a Wisdom check to be successful.

The Thief gains +1 to one skill category per level, applicable to the Ability score for purposes of the Ability check (or just subtract it from the die roll). The Thief’s Guild also modifies Skills in particular ways.