Tumble is the ability to dive, roll, somersault, flip, and so on.
Modifying ability: Dexterity
Classes: Bard, Monk, Rogue, Swashbuckler; Arcane trickster, Assassin, Duelist, Harper agent, Invisible blade, Shadow Thief of Amn, Shadowdancer
Requires training: Yes
Check: Tumbling past opponents without prompting an attack of opportunity is a check against DC of 15. This makes a character with a modified tumble skill of 14+ immune to attacks of opportunity from moving.
Use: Automatic
Tumble provides a +1 AC bonus for every 10 base ranks.