Speak Unto The Masses

Type of Feat: Class Specific
Prerequisite: Truenamer level 17
Specifics: You can choose to affect all creatures of a racial type within 30' of the target. This only affects utterances from the Lexicon of the Evolving Mind.
When you do so, the DC to speak the utterance changes as follows:
The racial type chosen is that of the creature targeted.
The DC becomes 15 + (2 * The highest CR creature of the chosen racial type in the area) + (2 * The number of targets beyond the first).
For example, you target a Goblin, and within the area are three other Goblins and one Goblin Shaman, for a total of five creatures.
The DC is 15 + (2 * 4 [The Shaman's CR]) + (2 * 4 [The four other creatures in the area]), for a total of 31.
Use: Selected.