Seven Deadly Sins: Origin Timespace Junction Sector 4 — Ancient Dragon
Everything you need to know before diving into Sector 4: which elements the dragon is weak to, the BP target, the time you need for each star, the shield phase to watch out for, and which heroes from your roster fit the fight.
Timespace Junction Sector 4 — Ancient Dragon
Ancient Dragon
The Sector 4 boss — high HP, very high DEF, only weak to Earth and Cold.A single-target fight with a long clear window but a hard shield phase mid-fight. Bring Earth + Cold, stack one element, and watch the rotation.
The 6 numbers you need before you queue
The dragon
The Ancient Dragon is the Sector 4 boss of the Timespace Junction. A massive single-target fight with very high HP and DEF, weak to Earth and Ice attacks, highly resistant to everything else.
"A giant dragon that has lived in Britannia since the distant past. It is as powerful as it is big."
Want the regular open-world version's page (lower difficulty)? Full boss page →
Sector 4 at a glance
What you need to know before you queue up:
| Bring these elements | Earth + Cold |
| Recommended Battle Power | 82,015 |
| Clear window | 8:00 |
| 3-star time | ≤ 2:30 |
| 2-star time | ≤ 4:00 |
Earth and Ice are the only elements the boss is actually weak to. Every other element gets reduced damage — you can finish the sector with off-element units, but it will be slow.
The dragon's shield phase
The dragon has a defensive shield the game internally calls the "Starsbook Shield". It's tied to the boss's phase changes — the dragon casts a skill to put the shield up, and a later skill to take it down. While the shield is up, expect damage to drop sharply.
- The shield goes up as part of the dragon's own skill rotation (not triggered by you).
- The shield comes back down when the dragon hits the next phase of its own kit.
- A separate phase-change effect — the "meteor" attack — runs for about 16.5 seconds when the dragon transitions phases.
The exact damage reduction the shield grants is not shipped in the data files. The shield itself is just a visual/state tag — the real mitigation happens inside the compiled game engine. So this page won't quote you a percentage we can't source. If you want testing numbers from the community, the Discord is the place — once they can be backed by a data file, they'll come back to this page.
Who to bring
Every released hero with at least one Earth or Ice weapon, sorted into DPS, support, and Burst-state specialists. Same grid as the Roster Reference — if a new hero releases with Earth or Ice, they'll show up here automatically.
| Main damage dealers (5) | Daisy, Diane, Dreyfus, Jericho, Mannie |
| Supports & tanks (5) | Clotho, Dredrin, Elaine, King, Tioreh |
| Heroes whose kit pays off in Earth or Ice Burst (7) | Daisy, Diane, Dreyfus, Elaine, Jericho, Mannie, Tioreh |
These picks cover the element side of the fight. The dragon's shield phase still shapes who actually clears it fastest — that's an engine-side mechanic this page can't quantify, see the section above.
Boss stats — Sector 4 tuning
These are the dragon's actual Timespace Junction Sector 4 stats — the exact numbers it brings into the fight, straight from the Sector 4 boss balance.
| Attack | 33,190 |
| Defense | 10,707 |
| HP | 2,638,583 |
| Crit Rate | 95.25% |
| Crit Damage | 251% |
| Crit Resist | 20% |
| Crit Damage Resist | 125.4% |
| Block Damage Resist | 95% |
| Protection Resist (Shatter Res) | 20% |
Elemental matchups
| Earth | +30% dealt (weakness) |
| Ice | +30% dealt (weakness) |
| Default | −20% dealt (resistance) |
| Thunder | −20% dealt (resistance) |
| Wind | −20% dealt (resistance) |
| Fire | −20% dealt (resistance) |
| Ice | −20% dealt (resistance) |
| Earth | −20% dealt (resistance) |
| Dark | −20% dealt (resistance) |
| Holy | −20% dealt (resistance) |
Only Earth and Ice deal bonus damage. Every other element is resisted — bring at least one Earth or Ice DPS, otherwise the fight runs out of time before it runs out of HP.
Where this comes from
- Boss identity & Sector 4 stats — from the Sector 4 boss balance entry (the same record that powers the Ancient Dragon boss page on this site for Timespace Junction). Stats, weaknesses and resistances are the in-fight values, not the open-world WL1 tuning.
- Sector context (elements, BP, time) — from the Timespace Junction configuration data, re-read live so it auto-updates after each balance patch.
- Roster picks — computed live from the released-hero list via the Roster Reference loader.
- Defensive shield mechanic — traced through the boss's own skill behaviour entries that apply and remove the shield buff, plus the phase-change skill that triggers the meteor effect.
Companion guides: Roster Reference · Damage Formula (PvE) · Ancient Dragon boss page