If you're using Console Commands mod, you can use command

"res rhox_queek_resource_'lord id' 1"

to complete a defeat LL condition. Example: res "res rhox_queek_resource_13 1" for Wurrzag


local legendary_lord_ids = {
--["character key"] (agent_subtypes) "id key" (character_traits)
["wh_main_emp_karl_franz"] =1,
["wh_main_emp_balthasar_gelt"] =2,
["wh_dlc04_emp_volkmar"] =3,
["wh_main_dwf_thorgrim_grudgebearer"] =4,
["wh_main_dwf_ungrim_ironfist"] =5,
["wh_pro01_dwf_grombrindal"] =6,
["wh_dlc06_dwf_belegar"] =7,
["wh_dlc05_wef_orion"] =8,
["wh_dlc05_wef_durthu"] =9,
["wh_main_grn_grimgor_ironhide"] =10,
["wh_main_grn_azhag_the_slaughterer"] =11,
["wh_dlc06_grn_skarsnik"] =12,
["wh_dlc06_grn_wurrzag_da_great_prophet"] =13,
["wh_main_vmp_mannfred_von_carstein"] =14,
["wh_main_vmp_heinrich_kemmler"] =15,
["wh_dlc04_vmp_vlad_con_carstein"] =16,
["wh_dlc04_vmp_helman_ghorst"] =17,
["wh_pro02_vmp_isabella_von_carstein"] =18,
["wh_main_chs_archaon"] =19,
["wh_dlc01_chs_kholek_suneater"] =20,
["wh_dlc01_chs_prince_sigvald"] =21,
["wh_dlc03_bst_khazrak"] =22,
["wh_dlc03_bst_malagor"] =23,
["wh_dlc05_bst_morghur"] =24,
["wh_main_brt_louen_leoncouer"] =25,
["wh_dlc07_brt_fay_enchantress"] =26,
["wh_dlc07_brt_alberic"] =27,
["wh_dlc08_nor_wulfrik"] =28,
["wh_dlc08_nor_throgg"] =29,
["wh2_main_hef_tyrion"] =30,
["wh2_main_hef_teclis"] =31,
["wh2_main_lzd_lord_mazdamundi"] =32,
["wh2_main_lzd_kroq_gar"] =33,
["wh2_main_def_malekith"] =34,
["wh2_main_def_morathi"] =35,
--["wh2_main_skv_queek_headtaker"] =36, --not going to cut his own head
["wh2_main_skv_lord_skrolk"] =37,
["wh2_dlc09_skv_tretch_craventail"] =38,
["wh2_dlc09_tmb_settra"] =39,
["wh2_dlc09_tmb_arkhan"] =40,
["wh2_dlc09_tmb_khalida"] =41,
["wh2_dlc09_tmb_khatep"] =42,
["wh2_dlc10_hef_alarielle"] =43,
["wh2_dlc10_hef_alith_anar"] =44,
["wh2_dlc10_def_crone_hellebron"] =45,
["wh2_dlc11_cst_harkon"] =46,
["wh2_dlc11_cst_noctilus"] =47,
["wh2_dlc11_cst_aranessa"] =48,
["wh2_dlc11_cst_cylostra"] =49,
["wh2_dlc11_def_lokhir"] =50,
["wh2_dlc12_lzd_tehenhauin"] =51,
["wh2_dlc12_skv_ikit_claw"] =52,
["wh2_dlc12_lzd_tiktaqto"] =53,
["wh2_dlc13_emp_cha_markus_wulfhart"] =54,
["wh2_dlc13_lzd_nakai"] =55,
["wh2_dlc13_lzd_gor_rok"] =56,
["wh2_dlc14_brt_repanse"] =57,
["wh2_dlc14_def_malus_darkblade"] =58,
["wh2_dlc14_skv_deathmaster_snikch"] =59,
["wh2_pro08_neu_gotrek"] =60,
["wh2_dlc15_hef_imrik"] =61,
["wh2_dlc15_hef_eltharion"] =62,
["wh2_dlc15_grn_grom_the_paunch"] =63,
["wh2_dlc16_wef_drycha"] =64,
["wh2_dlc16_wef_sisters_of_twilight"] =65,
["wh2_dlc16_skv_throt_the_unclean"] =66,
["wh2_twa03_def_rakarth"] =67,
["wh2_dlc17_lzd_oxyotl"] =68,
["wh2_dlc17_bst_taurox"] =69,
["wh2_dlc17_dwf_thorek"] =70,
["wh3_main_cth_miao_ying"] =71,
["wh3_main_cth_zhao_ming"] =72,
["wh3_main_dae_daemon_prince"] =73,
["wh3_main_kho_skarbrand"] =74,
["wh3_main_ksl_boris"] =75,
["wh3_main_ksl_katarin"] =76,
["wh3_main_ksl_kostaltyn"] =77,
["wh3_main_nur_kugath"] =78,
["wh3_main_ogr_greasus_goldtooth"] =79,
["wh3_main_ogr_skrag_the_slaughterer"] =80,
["wh3_main_sla_nkari"] =81,
["wh3_main_tze_kairos"] =82,
["wh3_main_dae_belakor"] =83,
["wh3_dlc20_sla_azazel"] =84,
["wh3_dlc20_nur_festus"] =85,
["wh3_dlc20_kho_valkia"] =86,
["wh3_dlc20_tze_vilitch"] =87,
}