Racial Stealth Modifier

Every race has a racial stealth modifier associated with it. From the in-game help for Racial Stealth:

Stealth is two-fold: A stealthy race is less likely to be attacked by aggressive mobs when a less-stealthy target also presents itself.

A stealthy race will also succeed more often with rogue skills such as blackjack, backstab and sneak attack.

Some examples of stealthy races include Drow, Halfling and Demonseed.

Some examples of non-stealthy races include Giant, Troglodyte and Troll.

Because we can't be sure exactly what the number is, we have simply assigned each race a rating of -3 to 2, with negative numbers being a penalty, 0 meaning "no modifier", and 2 being the best modifier possible. -3 is a failure rate of approximately 50%, -2 is 20%, and -1 is 10%. Note that size and groupsize both affect the success rate of disengage and slip, and are separate from the inherent stealth modifier.

There is also a separate archery damage modifier and melee damage modifier for each race.

Please note that all of this information has been gleaned from race pages here as well as discussion in-game, and is subject to change at any time. Also, entries for evolution races should reflect their maximum (highest evolve).

Legend
Great	2
Good	1
Average	0
Below Average	-1
Bad	-2
Terrible	-3

Creatable Races Stealth Modifiers

Race	Size	Racial Stealth Modifier
Centaur	L	-1
Deep Gnome	S	0
Draconian	M	0
Drow	M	0
Duergar	S	0
Dwarf	S	0
Elf	M	0
Ent	vL	-2
Firedrake	vS-vL	-3
Gargoyle	M	0
Giant	vL	-1
Gnome	S	0
Goblin	S	0
Halfling	S	2
Half-Elf	M	0
Half-Orc	M	0
Harpy	M	1
Human	M	0
Imp	vS-vL	-2 to 1
Kobold	S	-1
Kzinti	M	2
Lizardmen	M	1
Ogres	L	-1
Orc	M	1
Troglodyte	M	-2

Remort Races Stealth Modifiers

Race	Size	Racial Stealth Modifier
Demonseed	S	2
Dragon	vL	-2
Golem	L	-2
Griffon	L	1
High Elf	M	1
Hobgoblin	S	1
Minotaur	L	-2
Miraar	M	0
Sprite	vS	0
Troll	L	-1
Tuataur	M	2