Diablo II: Lord of Destruction/Shape Shifting

Strictly a personal skill, shape-shifting lets a druid transform himself into a wolf or bear creature and then apply skills particularly suited to each of these types of beings.

Werewolf
As a werewolf, a druid's attack speed, attack rating, life supply, and stamina are all increased. When used in conjunction with lycanthropy, feral rage, and other skills, this skill enables the druid to transform into a fearsome melee fighter. To leave werewolf form, cast werewolf again--this returns you to human form. In were form, a druid cannot cast elemental skills.
 * Description: Transforms a druid into wolf form
 * Level prerequisite: 1
 * Skill prerequisite: None
 * Mouse button: Right

Lycanthropy
Players tired of re-shape-shifting will want to sink a few skill points into lycanthropy, as will hardcore players who focus on shape-shifting.
 * Description: Bumps up the amount of time that a druid can stay in were form and augments the druid's life supply
 * Level prerequisite: 1
 * Skill prerequisite: Werewolf
 * Mouse button: Passive

Werebear
Much like werewolf, this spell changes the druid into another form that has increased life and defense and dishes out greater damage. Werebear is not as nimble as werewolf but is hardier. To leave werebear form, cast werebear again (or werewolf)--this returns you to human form. In were form, a druid cannot cast elemental skills.
 * Description: Transforms a druid into bear form
 * Level prerequisite: 6
 * Skill prerequisite: None
 * Mouse button: Right

Feral Rage
The strength of feral rage is indicated by the blob of orange light that orbits the werewolf; the brighter the blob, the more powerful the effects of feral rage. After a short time without attacking enemies, feral rage will subside to nothing.
 * Description: An attack that becomes ever more powerful as the druid, in werewolf form, strikes enemies
 * Level prerequisite: 12
 * Skill prerequisite: Werewolf
 * Mouse button: Left or right

Maul
Much like feral rage for werewolf form, this skill's strength is displayed in the guise of an orbiting globe that brightens as the werebear defeats enemies. If no enemies are slain within a short time period, maul will fade away.
 * Description: An attack that becomes ever more powerful as the druid, in werebear form, slays enemies
 * Level prerequisite: 12
 * Skill prerequisite: Werebear
 * Mouse button: Left or right

Rabies
Spread a plague among the foes by attacking with rabies, which causes a chain-reaction poison attack to spread throughout the attackers. Any poisoned foe will transfer that poison to anyone it comes in contact with. Because poison takes time to have full effect, and because of this spell's unique plague-like characteristic, a werewolf with rabies should attack multiple targets in an enemy crowd, using his stamina and speed to dart around the edges of mobs.
 * Description: A werewolf attack that poisons not only the target but also any enemies who brush up against the target
 * Level prerequisite: 18
 * Skill prerequisite: Feral Rage
 * Mouse button: Left or right

Fire Claws
This attack may be used with either form of were creature. It affects only the target creature, not those surrounding it.
 * Description: A were attack that not only adds fire damage but also boots the attack rating of a changeling druid
 * Level prerequisite: 18
 * Skill prerequisite: Maul
 * Mouse button: Left or right

Hunger
At a tremendous cost to damage, this attack returns life and mana to the druid for each hit scored.
 * Description: A were attack that trades in damage benefits for life- and mana-leeching benefits
 * Level prerequisite: 24
 * Skill prerequisite: Fire Claws
 * Mouse button: Left or right

Shock Wave
Not to be used as a primary attack, shock wave temporarily stuns all opponents close to and in front of a werebear, letting it strike with impunity. Its high mana cost and low damage makes it a skill that should be used in conjunction with some other attack, like fire claws or maul. When assigned to the right mouse button, shock wave does not need a specific target; when assigned to the left mouse button, it does.
 * Description: A wave that emits from a werebear, stunning all enemies in its path
 * Level prerequisite: 24
 * Skill prerequisite: Maul
 * Mouse button: Left or right

Fury
Much like a paladin's zeal skill, fury lets a werewolf attack two or more targets with a single click. If only one target is available, all attacks will be unleashed on it alone.
 * Description: Increases attack bonuses for a werewolf and automatically attacks multiple times
 * Level prerequisite: 30
 * Skill prerequisite: Rabies
 * Mouse button: Left or right