There were some wrong-placed values, here is working npcgrp.dat for INTERLUDE if needed ;)
50005 LineageMonster2.buffalo caravan1.caravan_delf 4 caravan_delf.house_t6 caravan_delf.Manor_godard_various1 caravan_delf.caravan_slave_t00 caravan_delf.caravan_slave_t01 0 1 0 1.000000 0 3 ItemSound.fist_1 ItemSound.fist_2 ItemSound.fist_3 5 ItemSound.armor_leather_1 ItemSound.armor_leather_3 ItemSound.armor_leather_4 ItemSound.armor_leather_6 ItemSound.armor_leather_8 3 ChrSound.FNpc_Lady_Dmg_1 ChrSound.FNpc_Lady_Dmg_2 ChrSound.FNpc_Lady_Dmg_3 0 1 0 LineageEffect.a_u001_a 0 50.000000 250.000000 70.000000 1 0
npcname.dat:
50005 Caravan 99 99 33 -1
also INTERLUDE sql file was a little bit wrong, here is edited one with sql command to add it easily in DB:
INSERT INTO `custom_npc` VALUES ('50005', '50005', 'Caravan Delf', '0', '', '0', 'LineageMonster2.buffalo', '13', '77', '15', 'male', 'L2Monster', '40', '1200', '164', '3.95', '1.21', '40', '43', '30', '21', '20', '25', '0', '0', '9', '19', '3', '17', '304', '0', '333', '3907', '0', '0', '24', '125', '', '0', '0', '0', 'LAST_HIT')
maybe it could help somebody ;)