Chance to spawn boss when ordinary mobs were killed

Monster	Level	Boss	Level	Spawn rate (%)
Bear	8	Beruda Lize	8	1.0
Spirit of Fierce Giant Wolf	20	Wild Mane	11	5.0
Bloodthirsty Demon Vine	28	Joblid the Giant Flower	25	0.5
Winternight Ice Witch	35	Aisha	45	0.03
Ystra Winter Spider	35	Anselve	45	0.01
Silanklir	35	Aisha	45	5.0
Stone-Clawed Dragon	40	Scion Locface	45	10.0
Red Winged Harpy	45	Ayelo	48	0.1
Giant Needle Cactus	45	Giant Fruit Cactus	45	75.0
Giant Flower Cactus	45	Giant Needle Cactus	45	50.0
Giant Fruit Cactus	45	Giant Needle Cactus	45	75.0
Sandstone Messenger	55	Aisha	45	0.03
Sandstone Messenger	55	Aisha	45	0.03
Hippogriff King Wodjin	57	Furious Wodjin	75	55.0
Blind Hackman	58	Resentful Hackman	75	55.0
Spider Priestess Mandara	63	Resentful Mandara	75	55.0
Furious Wodjin	75	Hippogriff King Wodjin	57	100.0
Resentful Hackman	75	Blind Hackman	58	100.0
Resentful Mandara	75	Spider Priestess Mandara	63	100.0