Example WoW AddOn code for displaying range warnings for Imperator Mar'gok's Branded debuff

BrandedStatus_1.lua

local BRANDED_IDS = { 164004, 164005, 164006 } -- The spellIDs of each Branded debuff (Displacement, Fortification, Replication)
local NUM_BRANDED_DEBUFFS = #BRANDED_IDS

local BRANDED_NAMES = {}
for i = 1, NUM_BRANDED_DEBUFFS do
	local name = GetSpellInfo(BRANDED_IDS[i]) -- Get the localised spell name from the ID
	BRANDED_NAMES[i] = name -- Store it in the BRANDED_NAMES table
end

-- Display a Branded warning for the specified unit with the specified stacks of Branded
local function DisplayBrandedWarning(unit, stacks)
	local rangeNeeded = 100 * 0.5 ^ (stacks - 1) -- Each stack halves the range needed; i.e. 100, 50, 25, ...
	local distanceSquared, checkedDistance = UnitDistanceSquared(unit) -- Get the distance between the player and the unit
	
	local displayText = ("%s %d yards - Current %d yards"):format(UnitName(unit), rangeNeeded, distanceSquared ^ 0.5) -- Build the string to display
	-- Display the text in some way here
end

-- Call this function to iterate through each raid member and check if they have a Branded debuff
local function UpdateBrandedStatus()
	for i = 1, 40 do -- For each raid member
		local unit = "raid" .. i
		if UnitExists(unit) and not UnitIsUnit(unit, "player") then -- If this raid member exists and isn't the player
			for i = 1, NUM_BRANDED_DEBUFFS do -- For each Branded debuff
				local name, _, _, count = UnitDebuff(unit) -- Check if the unit has the debuff
				if name then -- If they do
					DisplayBrandedWarning(name, count) -- Display a Branded warning
					break -- Exit this loop
				end
			end
		end
	end
end

BrandedStatus_2.lua

-- This version of the code only displays a warning for a single raid member with a Branded debuff

local BRANDED_IDS = { 164004, 164005, 164006 } -- The spellIDs of each Branded debuff (Displacement, Fortification, Replication)
local NUM_BRANDED_DEBUFFS = #BRANDED_IDS

local BRANDED_NAMES = {}
for i = 1, NUM_BRANDED_DEBUFFS do
	local name = GetSpellInfo(BRANDED_IDS[i]) -- Get the localised spell name from the ID
	BRANDED_NAMES[i] = name -- Store it in the BRANDED_NAMES table
end

-- Display a Branded warning for the specified unit with the specified stacks of Branded
local function DisplayBrandedWarning(unit, stacks)
	local rangeNeeded = 100 * 0.5 ^ (stacks - 1) -- Each stack halves the range needed; i.e. 100, 50, 25, ...
	local distanceSquared, checkedDistance = UnitDistanceSquared(unit) -- Get the distance between the player and the unit
	
	local displayText = ("%s %d yards - Current %d yards"):format(UnitName(unit), rangeNeeded, distanceSquared ^ 0.5) -- Build the string to display
	-- Display the text in some way here
end

-- Call this function to iterate through each raid member and check if they have a Branded debuff
local function UpdateBrandedStatus()
	for i = 1, 40 do -- For each raid member
		local unit = "raid" .. i
		if UnitExists(unit) and not UnitIsUnit(unit, "player") then -- If this raid member exists and isn't the player
			local brandedFound = false -- Does this unit have a Branded debuff?
			
			for i = 1, NUM_BRANDED_DEBUFFS do -- For each Branded debuff
				local name, _, _, count = UnitDebuff(unit) -- Check if the unit has the debuff
				if name then -- If they do
					DisplayBrandedWarning(name, count) -- Display a Branded warning
					brandedFound = true -- We found someone with a Branded debuff
					break -- Exit this loop
				end
			end
			
			if brandedFound then -- If this unit has a Branded debuff
				break -- Exit the outer loop
			end
		end
	end
end