Stars, a locked menu, and the Asriel Dreemurr fight

Spoilers

Barrier first, Hyperdeath next

True Pacifist closes at New Home's barrier: allies break up the Asgore duel first. Only then does Flowey seize every collected human SOUL, pull in nearly the full monster population, and stand again in Asriel's shape. The opening read treats you as the first fallen child.

God of Hyperdeath is the name most guides use for the first absolute form. Published checks put HP at 9999, attack at infinity with an 8 beside it, and defense at infinity with 9999 beside it. Hope and Dream sit under ACT, Serious Mode never lifts, and clearing the duel awards neither EXP nor gold.

What loads after Play is tripoid's fan remake of that finale, separate from buying UNDERTALE. A later phase swells into the Angel of Death silhouette people search for, and the command row collapses to Struggle until SAVE finally appears.

Spoilers

Named patterns until SAVE

Most of the kit paints the box in rainbow trails and star bursts. Before the line about a true final battle, a milder Fire Magic stretch lands. After that, expect star rain that blooms into rings, lightning after [!] marks, saber sweeps with leftover sparks, a blaster that charges a beam, and the screen-wide Hyper Goner vacuum.

Hyper Goner ends, Struggle idles, and ACT renames itself SAVE. Lost Souls step in one by one — Undyne first, then Alphys, Papyrus, Sans, Toriel, Asgore last — and every successful rescue tops HP while FIGHT never lands. Clear the set and the Someone else reel takes over.

Sans and Undyne the Undying are the Genocide corridor and the Waterfall heroine elsewhere on this roster. Omega Flowey stays the Neutral flower after Asgore, and roaringknightfight.com keeps a separate copy of tripoid's project.

Spoilers

Reading the rainbow kit

Bring hardware keys. Steer with the arrow cluster, confirm with Z, cancel or rush typewriter text with X, and flip shake with P. Skip this section if you wanted the Neutral flower; the names below belong to the True Pacifist Asriel Dreemurr fight.

• When the sky rains giant stars that crack into circles, that wave is Star Blazing; the spinning cousin is Galacta Blazing.
• Lightning that follows a [!] mark is Shocker Breaker. The sequel version adds aimed bolts and a horizontal sweep after the mark.
• Blade passes that leave stray sparks are Chaos Saber. The faster pass that adds an extra cut is Chaos Slicer.
• A hand cannon that sprays patterned shots and then a held beam is Chaos Buster; the wild-fire cousin that detonates the beam across the box is Chaos Blaster.
• When the box swallows the whole screen and a vacuum yanks the heart, that is Hyper Goner: the first connect sets HP to 1, and further connects in that window stop dealing damage.
• During the towering Angel of Death stretch the commands collapse to Struggle until SAVE shows up, and side comets can still clip you while the menu is open.
• SAVE then steps through six Lost Souls from Waterfall heroine to throne room king: Undyne → Alphys → Papyrus → Sans → Toriel → Asgore. Rescues restore HP; swinging at them misses.