>I think I've read somewhere in a description that Rakash are known to speak in plurals... so how come in our common to Rakash dictionary we don't have plurals?

Because Rakash does not have a plural sound.

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"...I am inclined to think the focus of the [Warmage's] spellbook should be ways to make things explode, to help you make things explode, or to assist your victim in exploding." -Armifer