Needs review
Source: Epic Level Handbook

Description: You can cast any of your lesser spells silently.

Prerequisites: Epic Level, Spellcraft (24 ranks), Silent Spell, Ability to cast 9th-level arcane or divine spells

You may cast all 0-, 1st-, 2nd-, and 3rd-level spells as silent spells without using higher-level spell slots.

Special

You can gain this feat multiple times. Each time you take the feat, the spells of your next three lowest spell levels can now be silenced with no adjustment to their spell slots. Thus, a wizard who took this feat twice could cast his 0- through 6th-level spells as silent spells with no adjustment to their spell slots. This feat doesn't increase the casting time for those spells that normally become full-round actions when cast in metamagic form (including sorcerer spells and spontaneously cast spells, such as a good cleric's cure spells).