Blue Seal Stone

How to get

Monster	Lv	How	Quantity	Chance
Lith Scout	21	drop	53–109	70%
Gigant Slave	21	drop	53–109	70%
Lith Witch	24	drop	72–143	70%
Gigant Acolyte	24	drop	72–143	70%
Lith Warrior	27	drop	97–190	70%
Gigant Overseer	27	drop	97–190	70%
Lith Guard	30	drop	128–259	70%
Gigant Footman	30	drop	128–259	70%
Lith Medium	33	drop	108–211	70%
Gigant Cleric	33	drop	108–211	70%
Lith Overlord	36	drop	96–192	70%
Gigant Officer	36	drop	96–192	70%
Lith Patrolman	39	drop	89–178	70%
Gigant Raider	39	drop	89–178	70%
Lith Shaman	42	drop	56–111	70%
Gigant Confessor	42	drop	56–111	70%
Lith Commander	45	drop	33–62	70%
Gigant Commander	45	drop	33–62	70%
Lilim Magus	51	drop	133–267	70%
Nephilim Priest	51	drop	145–291	70%
Lilim Knight-Errant	54	drop	148–301	70%
Nephilim Swordsman	54	drop	148–301	70%
Lilim Marauder	57	drop	73–146	70%
Nephilim Guard	57	drop	73–146	70%
Lilim Seer	60	drop	7–15	70%
Nephilim Bishop	60	drop	8–16	70%

Chances are from the server scripts, without the server rates.