The early bird tome is a book received after completing The Elder Kiln in the 2 weeks following its release. Reading it provides 50,000 Magic, 30,000 Agility, and 100,000 experience in the combat skill of your choice (as long as the skill is over 75).
The screen that is shown upon receiving the tome
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- The examine text mentions rubbing it, which is usually for the case of xp lamps rather than tomes.