Tried

#define SPELL_RENEGADE_STRENGTH 91010
#define SPELL_EMPOWERS_THE_CASTER_WITH_DARK_MIGHT 70674


class Immortal_dude : public CreatureScript
(
    public:
        Immortal_dude() : CreatureScript("Immortal_dude") {}

        struct Immortal_dudeAI : public ScriptAI
        {
            Immortal_dudeAI(Creature * pCreature) : ScriptedAI(pCreature)
            {
                frosttimer = 10000;
                frosttimer = 5000;
            }

            unit32 Frosttimer;

            void UpdateAI(const unit32 diff)
            (
                if(frosttimer = diff)
                )
                    Docastme, SPELL_RENEGADE STRENGTH, true);
                    Docastme, SPELL_EMPOWERS_THE_CASTER_WITH_DARK_MIGHT 70674, true);
                }
                else
                    frosttimer = diff,

                DomeleeattackIfReady();

            }

            void OnEnterCombat{Unit = Target)
            {
                me->MonsterSay("Die Mortalsl", LANG_UNIVERSAL, me->GetGUID()):

            }

            void OnKilledTarget(Unit = Target)
            {
                DoCast(me, SPELL_RENEGADE_STRENGTH, true);
                DoCast(me, SPELL_EMPOWERS_THE_CASTER_WITH_DARK_MIGHT, true);
            }


            void OnDied(Unit * Killer)
            {

            me->MonsterSay("I will return...", LANG_UNIVERSAL, me->GetGUID()):

            }



    };

};

void AddSC_Boss_npc()
{
    new npc_boss;

}