Epic spell, Lure of Loquacity

Grimoire of Cosmic Entities Volume One By Eli Atkinson, William Church and Serge W. Desir, Jr.
Original Concept by Serge W. Desir, Jr.

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Lure of Loquacity
Enchantment (Compulsion) [Mind-Affecting]
Spellcraft DC: 93
Components: V
Casting Time: 1 standard action
Range: 75 ft.
Area: 20-ft. radius
Duration: 99 hours (D)
Saving Throw: Will negates
Spell Resistance: Yes

To Develop: 837,000 gp, 17 days, 33,480 XP. Seeds: compel (DC 19). Factors: 1-action casting time (+20), no somatic component (+2), change target to 20-ft. radius area (+2), increase spell’s saving throw DC by +20 (+40), dismissible by caster (+2), increase duration by 495% (+10).

Originally designed by Murmer, Duke of Philosophy, the caster of this spell calls on those within the target area to speak their minds, and leave nothing out. All those within the area of effect who fail a Will save with a +20 bonus to the usual DC, find themselves speaking aloud regarding all their thoughts, and doing so with more words than are absolutely necessary. Communication or other activities that rely on speech takes three times as long as usual (and thus spells with verbal components take three times as long to cast, generally three standard actions). In combat, creatures under the influence of the spell will clearly reveal what their tactics are as they go about their maneuvers. Bluffing becomes impossible; the use of Diplomacy and Intimidate may likewise be affected at the discretion of the DM, and depending on the affected creature’s real feelings about those with whom he treats.