Is there any way to gain access to Evasion without taking multiple levels of a class?

So, I have a character with a really, really, really bonkers Reflex save. It wasn’t really the design plan, but a combination of class features, ancillary benefits from traits, and stats meant that I ended up with one.

Given that, Evasion would be a really great feature to have – better still, the Twist Away feat, which requires Evasion, would be incredible for this particular character, and thematically fitting.

Problem is, dipping 2 levels of Rogue (or another class) is a larger setback than I’d like.

So, is there any way to get Evasion through a feat or other means? I’m particularly interested in permanent methods, in order to qualify for other feats. One level dips are worth mentioning, but not ideal, and if it helps any, the character is Mythic, on the Trickster path, and can expect to get to Tier 10 ‘someday’ (but not anytime soon).

I’m interested in solutions that might apply for any race/class/level combination, as it seems a handy thing to pick up in a variety of circumstances – especially since Twist Away exists. That said, my particular circumstance is a Half Elf, Swash 1/Investigator 7 (the ACG versions).

Does Evasion allow half damage even when unconscious?

Evasion is a class feature gained by Rogues and Monks at level 7:

At 7th level, your instinctive agility lets you dodge out of the way of certain area effects, such as a blue dragon’s lightning breath or a Fireball spell. When you are subjected to an effect that allows you to make a Dexterity saving throw to take only half damage, you instead take no damage if you succeed on the saving throw, and only half damage if you fail.

Does this feature allow a character to “dodge” area effects, taking half damage, even if they are unconscious?

How does Shield Master interact with a Rogue’s Uncanny Dodge and Evasion?

Shield Master: a) add shield’s AC to Dexterity saving throw; b) for Dexterity saving throws to do with effect you receive either no damage on a save; half damage* on a fail. (PHB p.170)

Uncanny Dodge: use Reaction to only get half damage* done by an attack. (PHB p.96)

Evasion: for area of effect damage requiring a Dexterity saving throw, you receive either no damage on a save; half damage* on a fail. (PHB p. 96)

Does a rogue’s Evasion work against spells that don’t target an area?

At 7th level, rogues gain the Evasion feature:

Beginning at 7th level, you can nimbly dodge out of the way of certain area effects, such as an ancient red dragon’s fiery breath or an ice storm spell. When you are subjected to an effect that allows you to make a Dexterity saving throw to take only half damage, you instead take no damage if you succeed on the saving throw, and only half damage if you fail.

The Immolation spell certainly allows a Dexterity save for half damage, but it is not an “area effect”:

Flames wreathe one creature you can see within range. The target must make a Dexterity saving throw. It takes 8d6 fire damage on a failed save, or half as much damage on a successful one. […]

Given that Evasion mentions dodging “certain area effects”, does that prevent it from working spells that do not target an area, such as immolation? Or does evasion apply to all Dexterity saves for half damage?

(Other example spells include enervation and flaming sphere.)

Does a Rogue’s Evasion work for spells?

The Rogue class at level 2 gain the ability Evasion:

At 2nd level and higher, a rogue can avoid even magical and unusual attacks with great agility. If she makes a successful Reflex saving throw against an attack that normally deals half damage on a successful save, she instead takes no damage. Evasion can be used only if the rogue is wearing light armor or no armor. A helpless rogue does not gain the benefit of evasion.

Does this also apply to spells that have a Reflex save for half damage, such as Fireball?

Potent Cantrip vs Evasion

A 7th level evocation wizard hits a 7th level rogue with a cantrip that requires a dex saving throw, like acid splash.

The wizard has Potent Cantrip that means any creature that succeeds the dex save will always take half damage. The rogue has evasion which means a save for half damage becomes save for none.

Potent Cantrip: Starting at 6th level, your damaging Cantrips affect even creatures that avoid the brunt of the effect. When a creature succeeds on a saving throw against your cantrip, the creature takes half the cantrip’s damage (if any) but suffers no additional effect from the cantrip.

Evasion: Beginning at 7th level, you can nimbly dodge out of the way of certain area effects, such as a red dragon’s fiery breath or an Ice Storm spell. When you are subjected to an effect that allows you to make a Dexterity saving throw to take only half damage, you instead take no damage if you succeed on the saving throw, and only half damage if you fail.

Since both of these are passive abilities, which takes priority and how much damage does the rogue take if it succeeds the dex save?

Potent Cantrip with Toll the Dead vs Evasion

I’ve been allowing the party’s big bad enemy (a tenth-level wizard) to essentially always do damage with toll the dead. Even against the party’s monk and rogue which have Evasion. And my group is claiming I’m cheating, or reading the rules wrong in my favor. But I thought it was pretty clear. Did I make a (R.A.W.) false ruling?

Potent Cantrip: Starting at 6th level, your damaging cantrips affect even creatures that avoid the brunt of the effect. When a creature succeeds on a saving throw against your cantrip, the creature takes half the cantrip’s damage (if any) but suffers no additional effect from the cantrip.

10th level Evocation Wizard casts toll the dead, and the party’s Rogue makes her required Wisdom saving throw.

Toll the dead: You point at one creature you can see within range, and the sound of a dolorous bell fills the air around it for a moment. The target must succeed on a Wisdom saving throw or take 1d8 necrotic damage. If the target is missing any of its hit points, it instead takes 1d12 necrotic damage.

Evocation Wizard rolls out the damage and divides it in half. Then the argument starts: Our Rogue claims that since she made her save, she actually takes zero damage.

Evasion: Beginning at 7th level, you can nimbly dodge out of the way of certain area effects, such as a red dragon’s fiery breath or an Ice Storm spell. When you are subjected to an effect that allows you to make a Dexterity saving throw to take only half damage, you instead take no damage if you succeed on the saving throw, and only half damage if you fail.

But it specifically says “Dexterity saving throw” so I assumed (perhaps incorrectly) that Evasion simply would not apply in this case, as toll the dead forces a Wisdom saving throw. And made her, and the party’s monk, take half damage. Did I screw over my party?