local NPC_ID = 190020 -- Edit ID with id of your npc
local BUFF_IDS = {53307} -- Feel free to add here more buffs

function BuffOnSight(event, creature, player)
        if (player:GetUnitType() == "Player" and creature:IsWithinDistInMap(player, 15)) then
        for k, v in pairs(BUFF_IDS) do
        if not player:HasAura(v) then
                        player:AddAura(v, player)
                        end
        end
    end
end

RegisterCreatureEvent(NPC_ID, 27, BuffOnSight)