Rogue optional abilities
From DDO wiki
Rogues can select one additional feat at levels 10, 13, 16, and 19 from the list below. Skill Mastery may be taken more than once.
Crippling Strike: Sneak attacks inflict 2 strength damage Defensive Roll: A chance to reduce attack damage at low health Improved Evasion: half damage on a failed reflex save Opportunist: 3% double strike chance and bypasses 10% fortification Skill Mastery: +1 on all skills Slippery Mind: two saving throws against Will-based enchantments