Any Tanith squad adds +1 to any cover saves they are allowed. In addition, opponents roll 2D6x2 instead of 2D6x3 when attempting to spot Tanith troops in a Night Fight.
Squad may deploy using Infiltrators special rule
All Tanith units may re-roll failed Reserve rolls. If a Tanith unit is affected by a result on the Alaitoc Ranger Disruption table from Codex: Craftworld Eldar, roll a dice, the result is ignored on the roll of a 4+.
Fights simultaneously vs enemies in cover. Both sides roll to hit and wound before making saves and removing casualties