cunning sneak & shadow walk

two ways of accomplishing this:

i) hybrid rogue/warlock, with hybrid talent feat and paragon hybrid talent feat; or

ii) rogue wearing phantom chaussures (level 18 boots).

this cunning sneak/shadow walk combination grants the characters the ability to make stealth check every round.

EDIT: the cursed shadow feat (dragon 385, prerequisite: assassin and warlock) grants the shadow walk class feature.