Absolutely. I think the key to making this feel special is to keep it broad enough for cinematic moments while also giving the DM a clear guideline for when it applies. Here's how I'd write it in a 5e-inspired style.
Moment of Triumph
Level 7 Feature
Once per short or long rest, you may call upon a Moment of Triumph.
A Moment of Triumph is a brief instant in which sheer determination, conviction, and the will to protect others allow you to accomplish what should be impossible.
When you invoke this ability, declare a single heroic action that directly furthers a meaningful goal or protects another creature. The action automatically succeeds if success is at all possible.
If the action would normally require an ability check, skill check, or saving throw, you instead treat the result as though you rolled exactly what was needed to succeed.
A Moment of Triumph can also allow you to momentarily exceed your normal limits, such as:
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Casting a spell despite having no remaining spell slots.
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Holding shut—or forcing open—a massive gate that would normally be beyond your strength.
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Making one final leap across an impossible gap.
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Enduring a blow that would otherwise stop you from protecting another.
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Accomplishing another similarly heroic feat, subject to the DM's approval.
A Moment of Triumph cannot:
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Instantly defeat a creature.
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Produce effects equivalent to powerful reality-altering magic (such as Wish).
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Automatically succeed at actions that are fundamentally impossible within the world's rules.
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Circumvent an entire encounter or adventure through a single declaration.
This feature represents destiny, resolve, and courage—not unlimited power. It creates the opportunity for a legendary moment, but the story continues afterward.
The idea behind Moment of Triumph is that every great hero has one instant where they accomplish something they shouldn't be able to. For one brief moment, training, exhaustion, fear, and even the normal rules seem to give way to determination.
For Thistle, that moment isn't fueled by anger or ambition. It's the quiet certainty that someone needs him.
"No... I have to."
And somehow... he does.
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