Offense is a skill tree in Ars Magica 2, found in the Occulus, along with Utility and Defense, the other active skill trees, and Talents, which is a passive skill tree. It is used for, as the name implies, more offensive spells, including things like Projectiles, Area of Effects, Beams, or even Waves of all sorts of different damage types.
The tree includes the following, from top (easier to get) to bottom (harder to get).
Shapes: Projectile, Contingency: Fire, Area of Effect, Beam, and Wave.
Components: Physical Damage, Forge, Ignition, Fire Damage, Lightning Damage, Frost Damage, Magic Damage, Drown, Blind, Freeze, Knockback, Astral Distortion, Storm, Silence, Fling, Watery Grave, and Fury.
Modifiers: Gravity, Bounce, Piercing, Solar, Velocity Added, and Damage.
Silver Spells: Blizzard, Starstrike, Firestorm, and Dismembering.
Some of the more useful items in here are the Shapes of Projectile and Area of Effect, the components of Damage Types, along with Forge and Ignition, maybe even blind, and the Modifiers of Damage and Bounce, although all of these shapes, components, and modifiers can be used to great effectiveness if they are used correctly.
|Projectile||Causes a Projectile to be launched||Blue||Shape|
|Area of Effect||Changes the spell to target an area||Green||Shape|
|Beam||Causes a Beam to be fired while right click is held||Red||Shape|
|Wave||Causes a Wave||Red||Shape|
|Contingency: Fire||Sets a spell to activate when the target is incinerated||Green||Shape|
|Force Damage||Makes spells deal force (normal) damage||Blue||Component|
|Forge||If target block can be melted, it will be replaced by it's molten equivalent (a Sand block becomes Glass (block), Wood becomes a Charcoal (item)||Green||Component|
|Ignition||Sets things on fire||Green||Component|
|Fire Damage||Deals Fire damage to Target||Blue||Component|
|Lightning Damage||Deals Lightning damage to Target||Blue||Component|
|Frost Damage||Deals frost damage to Target||Blue||Component|
|Magic Damage||Deals magic damage to Target||Blue||Component|
|Drown||Deals drowning damage to Target||Blue||Component|
|Blind||Grants the debuff Blindness||Green||Component|
|Freeze||Grants a debuff that acts like slowness||Green||Component|
|Knockback||Knocks back target||Green||Component|
|Astral Distortion||Disables teleportation through vanilla and ars magica means||Green||Component|
|Storm||Causes a thunderstorm||Red||Component|
|Silence||Grants debuff that stops target from using magic||Red||Component|
|Fling||Flings targets into the air||Green||Component|
|Watery Grave||Grants debuff that makes swimming harder||Green||Component|
|Fury||Grants a buff to target that acts like a combination of Swiftness, Haste and Strength that causes debuffs when it wears off||Red||Component|
|Gravity||Changes spell to be effected by gravity||Blue||Modifier|
|Bounce||Makes spells bounce before being destroyed||Blue||Modifier|
|Piercing||Adds piercing to spells (allows spells to pass their initial target and hit another)||Red||Modifier|
|Solar||Increases or decreases the strength of the spell according to the current time (peak power at Zenith, minimum during midnight)||Red||Modifier|
|Velocity Added||Increases Velocity caused by Shapes such as Fling||Red||Modifier|
|Damage||Increases damage of Components that deal damage (for example, Fire Damage. Lightning Damage, Starstrike)||Red||Modifier|