Marrok was not given Nightsister, Empire, or Imperial Remnant tags because he is a mercenary, with the Empire tag specifically omitted for gameplay reasons, as he already fits into Mercenaries and Inquisitorius.
His deck color is Rakdos (Black/Red).
When Mercenary allies inflict Purge due to Masked Hunter, bonus attacks from characters like Cad Bane or Canderous Ordo will inflict an additional stack of Purge for each bonus attack.
Inquisitors with Marrok's omicron are immune to percent based health damage, including the worms from Haven Medical Station and any other effect that deals percent based health damage.
Marrok's kit states he gains a stack of Soldier of Fortune whenever a Mercenary ally inflicts Purge. Mercenaries will be able to apply Purge as part of Marrok's unique ability.
Marrok's omicron, stating "If Marrok is present, enemies can't be revived," works like other uniques: as long as Marrok is on the field, enemies cannot revive their allies.
No specific Inquisitor is singled out for Marrok to replace; options depend on the situation.
Recommended mods for Marrok are Health and Potency. In-game mod recommendations are usually decided by the character's designer.
If multiple stacks of Purge are consumed from one enemy (e.g., by Eighth Brother's Circular Saw), the unique 3 dispel happens for each stack of Purge consumed.
The 20% Offense reduction from Masked Hunter does not stack.
Marrok's omicron has uses outside the Reva mission, being powerful in many Territory Battles missions, especially Dark Side or Neutral missions where enemies revive or percent-based Health damage occurs. Starting battles with +10 to +12 stacks of Soldier of Fortune is also noted as beneficial.
If Marrok attacks out of turn with 40 or more stacks of Soldier of Fortune, and no Purge stacks are resisted, he would inflict 6 stacks of Purge.
The stat bonuses in Patience require Inquisitors to work, so Mercenary allies will not receive bonuses from Marrok's Patience unique.
Marrok is eligible to participate in the Reva TB mission, and his omicron is noted as very useful for it.
The Offense reduction from Masked Hunter does not stack but applies to Galactic Legends.