Philter of Glibness– Potion (Dungeon Master Guide)
Philter of Glibness: This potion enables the imbiber to speak fluently–even tell lies–smoothly,
believably, and undetectably. Magical investigation (such as the 4th-level
priest spell, detect lie) will not give the usual results, but will reveal that some minor “stretching
of the truth” might be occurring.
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