i have only free version (h5, ertheia, shinemaker) . idk if there is something different in subscribers version.
i searched trough all .xml files for text <npc id="31281" (an npc inside an einhasad temple with quests). here are results for the main game only:
d:\L2J_Mobius\L2J_Mobius_01.0_Ertheia\dist\game\data\spawns\Others\24_16.xml
d:\L2J_Mobius\L2J_Mobius_01.0_Ertheia\dist\game\data\stats\npcs\31200-31299.xml
d:\L2J_Mobius\L2J_Mobius_02.5_Underground\dist\game\data\stats\npcs\31200-31299.xml
d:\L2J_Mobius\L2J_Mobius_03.0_Helios\dist\game\data\stats\npcs\31200-31299.xml
d:\L2J_Mobius\L2J_Mobius_04.0_GrandCrusade\dist\game\data\stats\npcs\31200-31299.xml
d:\L2J_Mobius\L2J_Mobius_05.0_Salvation\dist\game\data\stats\npcs\31200-31299.xml
d:\L2J_Mobius\L2J_Mobius_06.0_Fafurion\dist\game\data\spawns\Goddard\TownOfGoddard.xml
d:\L2J_Mobius\L2J_Mobius_06.0_Fafurion\dist\game\data\stats\npcs\31200-31299.xml
d:\L2J_Mobius\L2J_Mobius_07.0_PreludeOfWar\dist\game\data\stats\npcs\31200-31299.xml
d:\L2J_Mobius\L2J_Mobius_08.2_Homunculus\dist\game\data\stats\npcs\31200-31299.xml
d:\L2J_Mobius\L2J_Mobius_09.2_ReturnOfTheQueenAnt\dist\game\data\stats\npcs\31200-31299.xml
d:\L2J_Mobius\L2J_Mobius_10.3_MasterClass\dist\game\data\stats\npcs\31200-31299.xml
d:\L2J_Mobius\L2J_Mobius_11.3_Shinemaker\dist\game\data\stats\npcs\31200-31299.xml
d:\L2J_Mobius\L2J_Mobius_12.1_PathOfRogue\dist\game\data\stats\npcs\31200-31299.xmlit exists in the spawn lists only for fafurion and in my patch. i also just checked shinemaker, the temple is empty too as it is for ertheia. i think i've got these spawns from h5 but edited them, because "respawnTime is not valid for npcs". and you can check pre god chronicles, this npc spawned by 2 other methods
d:\L2J_Mobius\L2J_Mobius_CT_0_Interlude\dist\game\data\spawns\Goddard\GoddardNPCs.xml
d:\L2J_Mobius\L2J_Mobius_CT_2.4_Epilogue\dist\game\data\spawns\Castles\Goddard.xml
d:\L2J_Mobius\L2J_Mobius_CT_2.6_HighFive\dist\game\data\spawns\Castles\Goddard.xmlfor essence they are spawned by "TownOfGoddard.xml" mostly (at the beginning they are in aden)