Whether you are a magical prodigy or a wise elder who has spent years honing their craft, you have dedication and talent for spellcasting, and that devotion is paying off. You have discovered a method of spellcasting which leaves ripples in the weave, fleeting artefacts which echo your original intent.
When casting a spell which leaves no effect when the target succeeds a saving throw against your spell save DC, as with Acid Splash or Hypnotic Pattern, your masterful spellcasting leaves a lingering effect on the target. The duration for the effect becomes half the length the original spell would have lasted, with the exceptions of spells with instantaneous effects, which stay instantaneous, and spells lasting two or more years being reduced to one year.
The effect is a lesser version of the spell cast, one third the level of the original spell, rounded down. The effect is mostly mundane at lower levels. An acid cantrip may cause the target to itch, an illusion may cause the target to hear voices or see things, etc. At higher levels, a second level spell will have similar effects to a cantrip, and a sixth level spell such as Mental Prison will have a similar effect to a second level spell such as Phantasmal Force.
Whether to change the spell into a lower level spell with similar effects, as with the Mental Prison to Phantasmal Force example, or to tone down the effects of the original spell cast, is at the discretion of the Dungeon Master. Targets with innate magical resistance are immune to the effects left by this feat.
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