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=== Invocations (SP): ===
A warlock has a repertoire of attacks, defenses, and other abilities known as invocations, which allow her to focus the demonic energy that suffuses her soul. A warlock can use any invocation she knows at will.
A warlocks invocations are like spell-like abilities; using an invocation is therefore a standard action that provokes attacks of opportunity. To avoid provoking such attacks, a warlock can use a invocation defensively by making a successful consentration check. An invocation can be disrupted, just as a spell can be ruined during casting. If a warlock is hit by an attack while ivoking, she is entitled to a Concentration check to successfully use the invocation, just as a spell caster would be. Her invocations are subject to spell resistance unless an invocation’s description specifically states otherwise. A warlock’s caster level with her invocations is equal to her class level.  She can dismiss any invocation as a standard action, just as a wizard can dismiss a spell. 
If an invocation allows a saving throw, its DC is 10+ the equivalent spell level + the warlock’s Cha modifier. Sins spell-like abilities are not spells, a warlock cannot benefit from the Spell Focus feat or from draconic feats that let her convert or spend an arcane spell slot to produce some other effect. She can, however, benefit from the ability Focus feat (MM303), as well as from feats that emulate metamagic effects for spell-like abilities.
The four grades of invocations, in order of their relative power, are least, lesser, greater, and dark. A 1st-level warlock begins with knowledge of one least invocation, gaining access to more invocations and higher grades as she attains levels. At any level when a warlock learns a new invocation, she can also replace an invocation she already knows with another invocation of the same or lower grade. Se Invocations, below, for a list of available invocations. 
Unloike other spell-like abilities, draconic invocations are subject to arcane spell failure chance as described under Weapon and Armor Proficiency, above.