Invisibility

{{Spelldescription
 * image         = Screenshotinvisibility.jpg
 * icon		= Invisibility.png
 * school		= Illusion
 * type1		=
 * type2		=
 * type3		=
 * type4		=
 * artificer	=
 * bard		= 2
 * druid		=
 * sor n wiz	= 2
 * cost		= 15
 * components	= {{V}}, {{S}}, {{M}}
 * metamagic	= {{Enlarge}}, {{Eschew}}, {{Extend}}, {{Quicken}}
 * range		= Standard
 * target		= Friend, Self
 * duration	= 1 minute per caster level (no maximum)
 * save		= None
 * sr		= No
 * cooldown	= 3 seconds (Wizard/Bard), 1.75 seconds (Sorcerer)
 * description	= An ally becomes invisible, vanishing from sight, even from darkvision. If he or she attacks a target or interacts with objects, the effect is removed.

Invisibility essentially works as +20 buff to target's Hide skill. Target is considered to be sneaking even when running at full speed. Enemies may still hear an invisible target if their Move Silently skill is lower then the enemy's Listen skill. If enemies hear you while you're invisible, they will still pursue you, and attempt to attack where they believe you may be, based on their Listen skill.

What removes invisibility: What does not remove invisibility:
 * Attacking and hitting a target - if you hit thin air or miss, it won't break.
 * Casting any offensive spell - anything that deals damage or would cause any aggro.
 * Interacting with most objects - opening a door, pulling a lever, activating a rune - anything that brings up a progress bar generally.
 * Casting buffs or healing spells (except as an attack upon undead).
 * Playing bardic music.
 * Picking up objects such as a crest.
 * Talking to NPCs.

Scrolls
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 * Morna Wyrmtouched  in The Marketplace Bazaar - 15pp, UMD: 24