Leap Attack

Diablo II	Notation	Basic	Class	Skill	Item	Ally	Quest	Area	Monster	Tale

1
2

Bash
Leap

3
4

Double Swing
Stun

5
6

Double Throw
Leap Attack

7
8

Concentrate
Frenzy

9
10

Whirlwind
Berserk

Type	Medium range melee single attack (LoD) Medium range melee single attack and area of effect damage (D2R)
Tier	4
Required level	18
Required skills	Leap
Requirements	Melee weapon
Left button	Yes
In town	No
Mana cost	9 (LoD) 10 (D2R)
Attack no mana	No
Weapon damage	100% (single attack) No (area of effect)
Synergy skills	Leap

Level01
6
12
18
24
30

A young treasure hunter once sought his fortune in a raid for Barbarian gold on Mount Arreat. Hearing tales of the Barbarian people's expertise in close combat, he hired a phalanx of mercenary spearmen to accompany him, thinking their long spears would force the Barbarian warriors to fight from a distance. He soon learned his mistake as a single Barbarian warrior was enough to slaughter his entire party. Ambushing the raiding party from a patch of scrub grass, the Barbarian leapt over them, slaying one whilst airborne, and skewering two more as he landed. Before the would-be thief could draw a single breath, all of his hired lancers had been dispatched. It was a long walk home.

Detail

Stat	Level
Stat	1-8	9-16	17-22	23-28	>28
Area of Effect Minimum Physical Damage (D2R only)	6 + (4*slvl)	(8*slvl) - 26	(12*slvl) - 90	(16*slvl) - 178	(20*slvl) - 290
Area of Effect Maximum Physical Damage (D2R only)	12 + (8*slvl)	(16*slvl) - 52	(24*slvl) - 180	(32*slvl) - 356	(40*slvl) - 580

Stat	Value
+% Attack Rating	35 + (15slvl) (LoD) 80 + (20slvl) (D2R)
+% Damage	70 + (30slvl) (LoD) 170 + (30slvl) (D2R)
+% Damage	10*Leap.blvl
+% Physical Damage (Area of Effect only) (D2R only)	10*Leap.blvl

Can leap over obstacles, monsters (including Barricades, Barricaded Doors, and Barricaded Towers), players, mercenaries and pets to targeted point within range and line of sight. Strangely, this includes leaping over archways in the Inner and Outer Cloisters and over bars in the Jails and Flayer Dungeon.

Barbarian leaps over bars in Flayer Dungeon (presumably the ceiling is thick enough to allow him to smash through it without breaking the surface of the upper floor).

When leaping to the top edge of the screen using the right mouse button, distance leapt can be increased by opening the Character (C key by default) or Hireling (O) screen on the left side, or the Inventory (I) or Skill (S) screen on the right side. [1]
There is no stamina loss when leaping.
Movement speed does not affect time spent leaping: it is always equivalent to base run speed (75% faster than base run speed in D2R). [2] Leaping animation itself has minimum length of 15 frames, with take-off in the sixth frame and landing in the twelfth frame. [3]
While leaping, can still be hit by melee attacks and radial effects like auras, curses and explosions when within range.
Missiles cannot normally collide with Barbarian while leaping, whether they are static like ground fires or fired horizontally or vertically. However, he can still be hit by missiles fired by ranged unit when directly above it as it fires. [4]
Hit checks are still performed for attacks that require them, and blocking is still fully effective while leaping.
No Chance to Cast modifiers apply while leaping, although Chance to Cast on Attack, on Striking, When You Kill an Enemy and When You Level-up are applied by the attack.
Cannot switch weapons or access inventory, potions or other skills while leaping.
Selected target must be outside melee range before leaping, otherwise Attack is performed (in D2R Leap Attack will be performed even if selected target is within melee range). Target must be within melee range upon landing to execute Leap Attack. Chance of target moving out of range before landing can be reduced by equipping weapons with longer range.
Successful attack always knocks back eligible target. Overlay displayed is the same as that used by Bash, Charge and Crushing Blow.

Overlay upon successful attack.

Successful Leap Attack removes any stun length being applied to target. [5]
Applies 17% damage to players, as expected. [6]
Only weapon type affects length of Leap Attack sequence: does not speed up or slow down with any positive or negative attack rate modifiers.

Weapon	Minimum sequence length		Attacks per second
Weapon	Frames	Seconds	Attacks per second
Two weapons or bare handed	22	0.88	~1.14
All one-handed weapons	25	1.00	1.00
Two-handed sword	27	1.08	~0.93
All other two-handed weapons	28	1.12	~0.89

[7]

Minimum sequence length (and thus maximum attack rate) while attacking continuously cannot be achieved if target is selected or knocked back. Instead, place cursor at Barbarian's feet to minimise leaping distance to 2 yards (three sub-tiles), while selecting Leap Attack on right mouse button and holding it down without selecting a target, or while selecting it on left mouse button and holding it down with the Shift key without selecting target. This allows Leap Attack to be used against a target even when within melee range, and automatically selects new targets once previous targets have been knocked back or killed.
When a target is not selected and the Barbarian does not leap over or land on sub-tiles directly adjacent to a target within melee range, then the attack animation may not be executed even though the attack is: this can reduce the attack interval to a minimum of 15 frames, the minimum length of the leaping animation. [8] However, achieving this with consecutive attacks to the same target can be difficult, even when it is not knocked back.
When obstructed by targets, hold down Alt button to prevent target from being selected (although any items on the ground may be selected instead).
When attacking a selected target, it can be attacked continuously as long as it is knocked back out of melee range. Since leaping takes 7 frames longer, minimum attack intervals are as follows:

Weapon	Minimum attack interval		Attacks per second
Weapon	Frames	Seconds	Attacks per second
Two weapons or bare handed	28	1.12	~0.89
All one-handed weapons	31	1.24	~0.81
Two-handed sword	33	1.32	~0.76
All other two-handed weapons	34	1.36	~0.74

[9]

When attacking a selected and stationary target, positions for landing adjacent to target and final destinations of target after being knocked back are as follows:

Size 2 targets will normally end up within range 6 when Barbarian lands directly above, below or to left or right, otherwise they will be within range 5; size 3 targets will normally always end up within range 6 after being knocked back. Range adder 3-4 weapons place him in these ranges; only range adder 0-2 weapons normally place him outside, allowing consecutive Leap Attacks.

Source

Korlic uses Leap Attack for mobility, but does not perform an actual attack.

Skill bonus

+(1-3) Leap Attack (Barbarian Only) cannot normally spawn on ilvl >18 primal helms.

Level 1-60 stats (LoD)

Stat	Level
Stat	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20
+% Attack Rating	50	65	80	95	110	125	140	155	170	185	200	215	230	245	260	275	290	305	320	335
+% Damage	100	130	160	190	220	250	280	310	340	370	400	430	460	490	520	550	580	610	640	670

Stat	Level
Stat	21	22	23	24	25	26	27	28	29	30	31	32	33	34	35	36	37	38	39	40
+% Attack Rating	350	365	380	395	410	425	440	455	470	485	500	515	530	545	560	575	590	605	620	635
+% Damage	700	730	760	790	820	850	880	910	940	970	1,000	1,030	1,060	1,090	1,120	1,150	1,180	1,210	1,240	1,270

Stat	Level
Stat	41	42	43	44	45	46	47	48	49	50	51	52	53	54	55	56	57	58	59	60
+% Attack Rating	650	665	680	695	710	725	740	755	770	785	800	815	830	845	860	875	890	905	920	935
+% Damage	1,300	1,330	1,360	1,390	1,420	1,450	1,480	1,510	1,540	1,570	1,600	1,630	1,660	1,690	1,720	1,750	1,780	1,810	1,840	1,870

Level 1-60 stats (D2R)

Stat	Level
Stat	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20
Area of Effect Minimum Physical Damage	10	14	18	22	26	30	34	38	46	54	62	70	78	86	94	102	114	126	138	150
Area of Effect Maximum Physical Damage	20	28	36	44	52	60	68	76	92	108	124	140	156	172	188	204	228	252	276	300
+% Attack Rating	100	120	140	160	180	200	220	240	260	280	300	320	340	360	380	400	420	440	460	480
+% Damage	200	230	260	290	320	350	380	410	440	470	500	530	560	590	620	650	680	710	740	770

Stat	Level
Stat	21	22	23	24	25	26	27	28	29	30	31	32	33	34	35	36	37	38	39	40
Area of Effect Minimum Physical Damage	162	174	190	206	222	238	254	270	290	310	330	350	370	390	410	430	450	470	490	510
Area of Effect Maximum Physical Damage	324	348	380	412	444	476	508	540	580	620	660	700	740	780	820	860	900	940	980	1,020
+% Attack Rating	500	520	540	560	580	600	620	640	660	680	700	720	740	760	780	800	820	840	860	880
+% Damage	800	830	860	890	920	950	980	1,010	1,040	1,070	1,100	1,130	1,160	1,190	1,220	1,250	1,280	1,310	1,340	1,370

Stat	Level
Stat	41	42	43	44	45	46	47	48	49	50	51	52	53	54	55	56	57	58	59	60
Area of Effect Minimum Physical Damage	530	550	570	590	610	630	650	670	690	710	730	750	770	790	810	830	850	870	890	910
Area of Effect Maximum Physical Damage	1,060	1,100	1,140	1,180	1,220	1,260	1,300	1,340	1,380	1,420	1,460	1,500	1,540	1,580	1,620	1,660	1,700	1,740	1,780	1,820
+% Attack Rating	900	920	940	960	980	1,000	1,020	1,040	1,060	1,080	1,100	1,120	1,140	1,160	1,180	1,200	1,220	1,240	1,260	1,280
+% Damage	1,400	1,430	1,460	1,490	1,520	1,550	1,580	1,610	1,640	1,670	1,700	1,730	1,760	1,790	1,820	1,850	1,880	1,910	1,940	1,970

Reference

Combat Skills (Arreat Summit)
Arbeitshread Frogger (PlanetDiablo.eu)
Titan Leap Attacker (D2 Barbarian)
Nefarius, A little known fact about Leap Attack (Phrozen Keep)
Swarmalicious, The Flying Booyaka
TitanSeal, [FAQ] Bewegungs- und Animationsgeschwindigkeiten Teil 3: Sequenzanimationen (PlanetDiablo.eu)