On Attack

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

All Skills	Random Class Skills	Fire Skills	Skill bonus	Oskill	Aura Equipped	Charges	Charged suffix
Chance to Cast	On Attack	On Striking	When Struck	When You Die	Kill an Enemy	Level-up

Chance to cast on attack is applied whenever using a melee attack, even when that attack misses or gets blocked, or if Dodge, Evade or Weapon Block are applied.
Not applied when using a ranged attack or missile weapon (Amazon bow, bow or crossbow), except when a Werewolf or Werebear is using a missile weapon with a melee attack.
Applied by Blade Shield, although it is applied as on Striking.
Charged Bolt and Frozen Orb are cast at the target from the user's location; all other skills below are cast at or from the target's location.

Sorceress skill

On Attack suffixes can spawn on magic, rare and crafted items.
On Attack suffixes are in the same affix group as on Striking, When Struck and charged suffixes.

Suffix	Level	% Chance	Source	Min Rlvl	Min Alvl
of Firebolts	3	5	Weapon ¹	4	6
of Firebolts	4	10	Weapon ¹	15	20
of Icebolt	3	5	Weapon ¹	4	6
of Lightning	3	5	Weapon ¹	13	18
of Chain Lightning	3	5	Amulet Weapon ¹ Ring	18	25
	3	8		26	35
	5	8		33	45

¹ Excluding missile weapon

Skill	Level	% Chance	Source	Min Rlvl	Ladder
Charged Bolt	20	20	Last Wish axe/sword/hammer	65	Yes
Fire Ball	6	10	Todesfaelle Flamme Zweihander	46	No
Fire Ball	16-20	10	Hellslayer Decapitator ²	66	No
Nova	22	15	Destruction polearm/sword	65	Yes
Chain Lightning	14-20	5	Lightsabre Phase Blade ²	58	No
Glacial Spike	18	25	Death axe/sword	55	Yes
Frozen Orb	21	16	Rift polearm/scepter	53	Yes

² As detailed on the Chance to Cast main page, the skill level is not chosen at random from the specified range.