Boss stuff

local OnCombat, OnLeaveCombat, OnKilledTarget, OnDied, Phase_1, Phase_Last, Shadowbolt

--When he's aggro'd
function OnCombat(pUnit, event)
    pUnit:SendChatMessage(14, 0, "Only fools seek death!")
    pUnit:RegisterEvent(Phase_1, 5000, 0)
end

-- When he dies
function OnDied(pUnit, event)
    pUnit:SendChatMessage(14, 0, "I've got to run! NO! STAY AWAY FROM THE LIGHT!")
    pUnit:RemoveEvents()
end

-- When he kills a player
function OnKilledTarget(pUnit, event)
    pUnit:SendChatMessage(14, 0, "Fall to the shadows!")
end

-- When he leaves combat (either players run or entire group wipes
function OnLeaveCombat(pUnit, event)
    pUnit:SendChatMessage(14, 0, "The shadows have prevailed!")
    pUnit:RemoveEvents()
end

--Phase One
function Phase_1(pUnit, Event)
    if (pUnit:GetHealthPct() <= 50) then
        pUnit:RemoveEvents()
        pUnit:SendChatMessage(14, 0, "You're really starting to piss me off!")
        pUnit:RegisterEvent(Phase_Last, 5000, 0)
    end
end

--2nd and final phase
function Phase_Last(pUnit, event)
    if (pUnit:GetHealthPct() <= 20) then
        pUnit:RemoveEvents()
        pUnit:SendChatMessage(14, 0, "I can not fail! FELL THE SHADOWS!")
        --pUnit:Root() -- gonna wanna use this if he's a spellcaster to prevent moving around.
        pUnit:RegisterEvent(Shadowbolt, 3000, 0) -- This will cast it once every three seconds, if he's a caster you'll want him to chain it so set it to 1100 miliseconds as the cast time is 1 sec.
    end
end

function Shadowbolt(pUnit, event)
    if(not pUnit:IsCasting()) then -- check whether the NPC is casting already. If not, then cast again. Spellcasting can be delayed by the players. This also lets you use any time delay when registering Shadowbolt, since the spells wont interrupt eachother
        pUnit:FullCastSpellOnTarget(39026, pUnit:GetMainTank())
    end
end

RegisterUnitEvent(88803, 1, OnCombat)
RegisterUnitEvent(88803, 2, OnLeaveCombat)
RegisterUnitEvent(88803, 3, OnKilledTarget)
RegisterUnitEvent(88803, 4, OnDied)