You should be at least level 30+ for the starting zone (or have good Equipment). The northern castle is more difficult and requires level 175+. (Link is not up to date since the reset of August 2017)

Find more information here: Hunting Guide

	Creature	Exp	Exp/HP ratio	Health	Armor	Defense	Attack (melee)	Attack (magic)
	Grim Reaper	5500	3900	1.41	35	35	0	118
	Mystical Knight	4600	5200	0.88	40	40	200	193
	Fury	4500	4100	1.1	20	20	0	106
	Mythra Worshipper	3100	3300	0.94	40	40	150	136
	Mythra Guardian	2900	3400	0.85	40	40	190	74
	Phantom	2600	3000	0.87	0	0	130	115
	Creeper	2500	3100	0.81	0	0	250	15
	Giant Spider	900	1300	0.69	20	20	0	7
	Necromancer	580	580	1	25	25	0	27
	Adept Of The Cult	400	430	0.93	20	20	0	22
	Acolyte Of The Cult	300	390	0.77	15	15	0	18
	Mad Scientist	205	325	0.63	15	15	0	10
	Monk	200	240	0.83	20	22	0	0
	Mutated Human	150	240	0.63	30	30	0	16
	Novice Of The Cult	100	285	0.35	15	15	0	8
	Gladiator	90	185	0.49	20	22	0	0
	Gang Member	70	295	0.24	14	16	0	0
	Bandit	65	245	0.27	11	15	0	0
	Nomad	60	160	0.38	10	13	0	0
	Smuggler	48	130	0.37	10	13	0	0

Go back to Hunting Zones.