Child of Malkav
Erudite
NPCs in D2 detect you instantly, if you play with all custom difficulty markers on. Unless you abuse the Dark Vision power, you have no way of gathering information to plan an approach. If you play without powers then it's just trial an error until you know where every enemy is.
In Thief you can hide in shadows, you have sound propagation, you can use a scouting orb to assess your environment, NPCs locations and patrols and properly plan your actions. As well as in SC, Styx, Mark of the Ninja, Aragami, Hitman etc. In SC you gave a drone, sticky cameras, 3rd person view, shadows, in Styx you have 3rd person view, a clone which can be used for scouting but also for coordinated actions, shadows, in Hitman you gave 3rd person view, no shadows but a disguise system, in Aragami, shadows and 3rd person view, in MotN you have shadows, 2d view, visual representation of sounds etc.
In Thief you can hide in shadows, you have sound propagation, you can use a scouting orb to assess your environment, NPCs locations and patrols and properly plan your actions. As well as in SC, Styx, Mark of the Ninja, Aragami, Hitman etc. In SC you gave a drone, sticky cameras, 3rd person view, shadows, in Styx you have 3rd person view, a clone which can be used for scouting but also for coordinated actions, shadows, in Hitman you gave 3rd person view, no shadows but a disguise system, in Aragami, shadows and 3rd person view, in MotN you have shadows, 2d view, visual representation of sounds etc.