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How to Defeat Undyne the Undying in Undertale

Beat Undyne the Undying by switching tactics with your SOUL mode: block arrows with the shield in green mode and dodge spear patterns in red mode.
WorldUndertale Length2 min Posted Quest giverVGSources Team
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Undyne the Undying is a Genocide Route boss, not the standard Undyne encounter. The key is to switch tactics with your SOUL mode: in green mode, rotate the shield to block arrows; in red mode, move through gaps to avoid spears. Bring healing items, learn each attack pattern separately, and consider defensive equipment if surviving hits matters more than ending the fight quickly.

Prepare for the fight

Bring healing items and equip the strongest setup available in your current run. Avoid using healing automatically at the first opportunity; weigh your current health against the risk of the next attack.

If incoming damage is the main problem, the Undyne the Undying encounter reference suggests wearing the Torn Notebook and Cloudy Glasses. The combination increases invincibility time after taking a hit, but its lower attack power makes the fight last longer. It is a survivability tradeoff, not a guaranteed or universally best setup.

Do not assume that every item or piece of equipment available in another route can be obtained here. A complete route-specific inventory list is not established by the cited reference.

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Green SOUL: block the arrows

In green mode, your SOUL stays fixed in place, so you cannot dodge by moving around the board. Rotate the shield toward the side from which each arrow approaches. The volleys include arrows at different speeds and from multiple directions.

Later, during the second green cycle, yellow arrows appear and approach in a reversed orientation. Read each arrow’s cue instead of repeating the shield direction used for the previous volley.

  • Watch the direction and speed of one volley at a time.
  • Turn the shield toward the arrow’s approach direction to block it.
  • If you take a hit, identify which direction caught you and adjust for the next volley rather than rotating frantically.

Red SOUL: dodge the spear patterns

Red mode restores movement. The spear attacks come in distinct patterns; focus on finding a gap and changing position as the attack develops.

Converging rings

Rings of spears close toward your SOUL. Move through an opening, then reposition as the gaps narrow.

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Rotating rings

Eight-spear rings rotate while converging. Track the openings as they turn rather than committing to one straight path through the entire attack.

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Targeted spears

Individual spears aim at your SOUL. Keep moving and change direction so you are not lined up with the next strike.

Three-column attack

The board shrinks and spears rise in three columns. Find an opening and move into it. The encounter reference notes a pixel-perfect safe spot between the left and center spears for one attack; treat that as specific to that pattern, not as a general safe zone.

The reference gives a damage range of 8–14 per attack. Damage varies, so do not budget around a single assumed hit value: keep enough health to survive a mistake and heal when your health and the next attack’s risk warrant it.

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Use a repeatable response

First identify the active SOUL mode, then choose the matching action: shield direction in green mode, movement and gap-finding in red mode. Learn a controlled response to each attack family and repeat it. Defensive equipment can give you more room for error after a hit, but the lower attack power means you will face more attack cycles.

The cited reference describes the mechanics and patterns but does not establish a guaranteed attempt count, a tested no-hit route, or an exact button-by-button sequence. Your result depends on recognizing the patterns and executing the dodges.

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