Spellcasting: An Eldritch Scoundrel casts arcane spells from the wizard spell list, preparing them ahead of time just as a wizard does. Her number of spells per day is equivalent to a magus of the same level. She gains two new spells for her spellbook each time she gains a rogue level.
Sneak Attack +10d6: Elyn gains +4d6 sneak attack damage from her Eldritch Scoundrel levels. This is enhanced by the Accomplished Sneak Attacker feat and her Arcane Trickster levels for a grand total of +10d6.
Evasion: At 2nd level, if Elyn makes a successful Reflex saving throw against an attack that normally deals half damage, she instead takes no damage. This works only if she is wearing light or no armor.
Alarm Sense (Su): At 3rd level, Elyn gained an intuitive sense that warns her when she is within 10 feet of a magic trap, granting her an immediate Perception check to notice it. This ability replaced trap sense.
Rogue Talents: At 4th and 8th level, Elyn gained a rogue or ninja talent. The "Fast Stealth" talent allows her to move at full speed using the Stealth skill without penalty.
Trapfinding: Elyn adds half her level (+5) to Perception checks to locate traps and to Disable Device checks. She can use Disable Device to disarm magic traps.
Ranged Legerdemain (Su): Elyn can now use her Disable Device and Sleight of Hand skills at a range of 30 feet. Using these skills at a distance increases the DC by 5, and she cannot take 10 on the check.
Spells per Day: Upon taking her first level in Arcane Trickster, Elyn's effective spellcasting level increases by one. This grants her additional spell slots as if she had gained a level in Eldritch Scoundrel.
Impromptu Sneak Attack (Ex): Beginning at 3rd level,
once per day an arcane trickster can declare one melee or ranged attack
she makes to be a sneak attack (the target can be no more than 30 feet
distant if the impromptu sneak attack is a ranged attack). The target of
an impromptu sneak attack loses any Dexterity bonus to AC, but only
against that attack. The power can be used against any target, but
creatures that are not subject to critical hits take no extra damage
(though they still lose any Dexterity bonus to AC against the attack).
Tricky Spells (Su): Starting at 5th level, an arcane
trickster can cast her spells without their somatic or verbal components,
as if using the Still Spell and Silent Spell feats. Spells cast using this
ability do not increase in spell level or casting time. She can use this
ability 3 times per day at 5th level and one additional time per every two
levels thereafter.
Invisible Thief (Su): At 9th level, Elyn can become invisible, as if under the effects of greater invisibility, as a free action. She can remain invisible for a number of rounds per day equal to her arcane trickster level (10 rounds). Her caster level for this effect is equal to her character level. These rounds need not be consecutive.
Surprise Spells (Su): At 10th level, Elyn can add her sneak attack damage to any spell that deals damage, if the target is flat-footed. This extra damage only applies once per spell, even if it affects multiple targets.