Invocations: A warlock does not prepare or cast spells as other wielders of arcane magic do. Instead, he possesses a repertoire of attacks, defenses, and abilities known as invocations that require him to focus the wild energy that suffuses his soul. A warlock can use any invocation he knows at will, with the following qualifications:
A warlock’s invocations are spell-like abilities; using an invocation is therefore a standard action that provokes attacks of opportunity. An invocation can be disrupted, just as a spell can be ruined during casting. A warlock is entitled to a Concentration check to successfully use an invocation if he is hit by an attack while invoking, just as a spellcaster would be. A warlock can choose to use an invocation defensively, by making a successful Concentration check, to avoid provoking attacks of opportunity. A warlock’s invocations are subject to spell resistance unless an invocation’s description specifi cally
states otherwise. A warlock’s caster level with his invocations is equal to his warlock level.
The save DC for an invocation (if it allows a save) is 10 + equivalent spell level + the warlock’s Charisma modifier. Since spell-like abilities are not actually spells, a warlock cannot benefi t from the Spell Focus feat. He can, however, benefi t from the Ability Focus feat (see page 303 of the Monster Manual), as well as from feats that emulate metamagic effects for spell-like abilities, such as Quicken Spell-Like Ability and Empower Spell-Like Ability (see pages 303 and 304 of the Monster Manual).
The four grades of invocations, in order of their relative power, are least, lesser, greater, and dark. A warlock begins with knowledge of one invocation, which must be of the lowest grade (least). As a warlock gains levels, he learns new invocations, as summarized on Table 1–1 and described below. A list of available invocations can be found following this class description, and a complete description of each
invocation can be found in Chapter 4 of this book.
At any level when a warlock learns a new invocation, he can also replace an invocation he already knows with another invocation of the same or a lower grade. At 6th level, a warlock can replace a least invocation he knows with a different least invocation (in addition to learning a new invocation, which could be either least or lesser). At 11th level, a warlock can replace a least or lesser invocation
he knows with another invocation of the same or a lower grade (in addition to learning a new invocation, which could be least, lesser, or greater). At 16th level, a warlock can replace a least, lesser, or greater invocation he knows with another invocation of the same or a lower grade (in addition to learning a new invocation, which could be least, lesser, greater, or dark).
Finally, unlike other spell-like abilities, invocations are subject to arcane spell failure chance as described under Weapon and Armor Profi ciency above. Warlocks can qualify for some prestige classes usually intended for spellcasters; see Warlocks and Prestige Classes, page 18, for details.
