-- BOSS SPAWN SCRIPT

local NPC_ID = XXX -- Enter your npc id
local BOSS_ID = XX -- BOSS ID

function On_Gossip(event, player, unit)

player:GossipMenuAddItem(0, "Summon boss", 0, 1)
player:GossipSendMenu(1, unit)
end

function On_Select(event, player, creature, sender, intid, code)

if (intid == 1) then
local BOSS = PerformIngameSpawn(1, BOSS_ID, MAPID, INSTANCEID, X, Y, Z, O, false, 0, 1)
end
end

RegisterCreatureGossipEvent(NPC_ID, 1, On_Gossip)
RegisterCreatureGossipEvent(NPC_ID, 2, On_Select)