Actually, the biggest advantage of being a Gnome is the bonus to Saves.
It's based on CON. At 18+ CON, Gnomes, Dwarves and Halflings all get +5 to saves vs. spells, which is by far the most important one.
This cannot be overstated. +5!
Dwarves and Halflings get +5 to Death and Wands as well, Gnomes get +5 to Wands.
This is especially important if you solo.
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