1. The number of magic items found on a monster.
2. The number of properties on a magic item.
3. The intensity of the properties on a magic item.

The higher one's Luck, the higher the amount and intensity of increases will be. Luck is checked once for the number of items, once for each item (to determine the number of properties) and once for each property (to determine intensity). With a little luck you might get a small bump in one of three mentioned areas, with lots of a luck you might get a large bump in all three areas.

Some things to consider about Luck

• A monster will never drop more than the maximum amount of magic items his loot template allows.
• Luck is determined by the person that did the most damage to a monster.
• When most damage is done by a pet, summoned or provoked creature, the Luck factor of the controller of that creature is used.
• Luck has no effect whatsoever on treasure chests, fished up messages in bottles, town or dungeon chests, or power scrolls.
• Luck has no effect whatsoever when stealing items from monsters.
• Luck cannot make "low" level monsters give "high" level loot. You will still need to kill the toughest monsters to get the best possible loot.

A boost lasting for one hour can be gained once per day (24 hours) from the 10th Anniversary Statue. This boost varies according to account age, minimum being 200. An additional 50 luck is gained for each year of the account age, as shown on the character's profile.
A luck boost of 400 luck for 30 minutes is one of the blessings possible from the Fount of Fortune, a similar, though lesser, blessing can sometimes be obtained by paying the Sphynx 5000 gold, if you receive the message 'Fate smiles upon you this day', your luck will be boosted by a figure between 1 and 80 for 24 hours.
Samurai obtain a short boost when reaching Perfection

Luck - a practical overview
All figures for luck in this table have been rounded up from the value derived from the following formula; luck required = (bump chance)^1.8
Ratio of monsters which will have loot level bumped up	luck required
1 in 2	1144
1 in 3	550
1 in 4	329
1 in 5	220
1 in 10	64
1 in 20	19
1 in 25	13
1 in 50	4
Values for luck required have been rounded up, so in practice figures may be higher

Loot Bump chance with Common Luck Suits worn
Items made from Gold ingots or Spined Leather add 40 to your total luck. Yellow Dragon Armor items add 20. Percentage chance is calculated via the following formula; Chance of loot value increase = luck^(1/1.8)
Common item combinations worn	Total Luck	Percentage Chance that loot level will increase	Amount of monsters that will show increased loot*
Two Spined Leather or Gold items**	80	11.4%	1 in 9
Yellow Dragon Armor	100	12.9%	1 in 8
Golden Chainmail Suit [Three items]	120	14.3%	1 in 7
Golden Ringmail Suit [Four items]	160	16.8%	1 in 6
Spined Studded/Bone Armor Suit [Five items]	200	19.0%	2 in 11
Complete Spined/Gold Armor Suit [Six items]	240	21.0%	1 in 5
Complete Suit With One Gold Item in Hands	280	22.9%	2 in 9
Complete Suit With Two Gold Items in Hands	320	24.6%	~ 1 in 4
*Figures are approximated averages meant as a rough guide only for when out hunting. **Two of each type of leather is considered by many to give balanced resists

Chance that loot value will increase for a given value of luck
Luck translates directly into a percentage chance to get a bump in number of items, number of item properties and property intensity when looting a monster. The following formula is used; Chance of loot value bump = luck^(1/1/8)
Luck	Chance of Loot Bump		Luck	Chance of Loot Bump		Luck	Chance of Loot Bump		Luck	Chance of Loot Bump		Luck	Chance of Loot Bump		Luck	Chance of Loot Bump
10	3.6		210	19.5		410	28.3		610	35.3		810	41.3		1010	46.7
20	5.3		220	20.0		420	28.7		620	35.6		820	41.6		1020	46.9
30	6.6		230	20.5		430	29.0		630	35.9		830	41.9		1030	47.2
40	7.8		240	21.0		440	29.4		640	36.2		840	42.1		1040	47.4
50	8.8		250	21.5		450	29.8		650	36.5		850	42.4		1050	47.7
60	9.7		260	22.0		460	30.2		660	36.8		860	42.7		1060	47.9
70	10.6		270	22.4		470	30.5		670	37.2		870	43.0		1070	48.2
80	11.4		280	22.9		480	30.9		680	37.5		880	43.2		1080	48.4
90	12.2		290	23.3		490	31.2		690	37.8		890	43.5		1090	48.7
100	12.9		300	23.8		500	31.6		700	38.1		900	43.8		1100	48.9
110	13.6		310	24.2		510	31.9		710	38.4		910	44.0		1110	49.2
120	14.3		320	24.6		520	32.3		720	38.7		920	44.3		1120	49.4
130	14.9		330	25.1		530	32.6		730	39.0		930	44.6		1130	49.7
140	15.6		340	25.5		540	33.0		740	39.3		940	44.8		1140	49.9
150	16.2		350	25.9		550	33.3		750	39.6		950	45.1		1150	50.2
160	16.8		360	26.3		560	33.6		760	39.9		960	45.4		1160	50.4
170	17.3		370	26.7		570	34.0		770	40.1		970	45.6		1170	50.6
180	17.9		380	27.1		580	34.3		780	40.4		980	45.9		1180	50.9
190	18.4		390	27.5		590	34.6		790	40.7		990	46.2		1190	51.1
200	19.0		400	27.9		600	34.9		800	41.0		1000	46.4		1200	51.4
A monster has two types of loot, that which is generated at spawn (like gold, equipment carried, etc) and that which is generated upon death via the average luck of the party which is credited with the kill.

Luck value required for a given percentage chance of loot value being increased
For a desired chance to raise loot level, the luck required may be derived via the following formula; luck required = (chance to raise loot level)^1.8
Chance of loot bump	Luck required		Chance of loot bump	Luck required		Chance of loot bump	Luck required		Chance of loot bump	Luck required
0.5	0.3		13.5	108.3		26.5	364.6		39.5	748.0
1.0	1.0		14.0	115.6		27.0	377.1		40.0	765.1
1.5	2.1		14.5	123.2		27.5	389.8		40.5	782.4
2.0	3.5		15.0	130.9		28.0	402.6		41.0	799.9
2.5	5.2		15.5	138.9		28.5	415.6		41.5	817.5
3.0	7.2		16.0	147.0		29.0	428.9		42.0	835.3
3.5	9.5		16.5	155.4		29.5	442.3		42.5	853.3
4.0	12.1		17.0	164.0		30.0	455.8		43.0	871.5
4.5	15.0		17.5	172.8		30.5	469.6		43.5	889.8
5.0	18.1		18.0	181.8		31.0	483.6		44.0	908.3
5.5	21.5		18.5	190.9		31.5	497.7		44.5	926.9
6.0	25.2		19.0	200.3		32.0	512.0		45.0	945.8
6.5	29.1		19.5	209.9		32.5	526.5		45.5	964.8
7.0	33.2		20.0	219.7		33.0	541.2		46.0	983.9
7.5	37.6		20.5	229.7		33.5	556.0		46.5	1003.3
8.0	42.2		21.0	239.9		34.0	571.0		47.0	1022.8
8.5	47.1		21.5	250.3		34.5	586.2		47.5	1042.4
9.0	52.2		22.0	260.8		35.0	601.6		48.0	1062.3
9.5	57.5		22.5	271.6		35.5	617.2		48.5	1082.3
10.0	63.1		23.0	282.6		36.0	632.9		49.0	1102.4
10.5	68.9		23.5	293.7		36.5	648.8		49.5	1122.8
11.0	74.9		24.0	305.1		37.0	664.9		50.0	1143.3
11.5	81.1		24.5	316.6		37.5	681.2		50.5	1163.9
12.0	87.6		25.0	328.3		38.0	697.6		51.0	1184.7
12.5	94.3		25.5	340.2		38.5	714.2		51.5	1205.7
13.0	101.2		26.0	352.3		39.0	731.0		52.0	1226.9
Luck is an integer value, only capable of whole numbers. Decimal places are given for statistical purposes only.