* He felt invincible, like a mountain standing tall against the storm. (This emphasizes strength and unyielding power)
* She marched into the meeting, her confidence as invincible as a knight in shining armor. (This highlights boldness and unwavering confidence)
* Their love for each other felt invincible, as powerful as a raging ocean. (This emphasizes the strength and enduring nature of their love)
Remember, a simile uses words like "like" or "as" to compare two unlike things. You can choose the best simile based on what you want to emphasize in your sentence.