Alliance raids · five bosses
World boss guides — five bosses, one formula
Iron Colossus through Ancient Dragon, plus the HP-scaling math and weekly cadence every boss shares. Per-boss overlays cover comp recommendations and common-loss reasons.
TL;DR
Titan Saga: Idle has five alliance world bosses with base HP from 500K to 2M. The server scales actual HP by alliance level and member count using a single formula, so the picker advertises what actually spawns — no surprise health bars. Two spawns per alliance per week, reset Monday 00:00 UTC. Pick by what your alliance can clear, not by what looks impressive.
The shared HP formula
Every boss spawn uses the same scaling math, server-side:
scaled_hp = base_hp × (1 + alliance_level × 0.15) × max(member_count / 10, 0.5)
Three knobs: the boss's base HP (column below), your alliance level (15% multiplier per level), and your member count divided by 10 (clamped to a 0.5× floor so small alliances aren't punished out of the system). A level-10 alliance with 10 members fights the base HP × 2.5; a level-1 alliance with 5 members fights the base HP × 0.575.
The picker UI runs the same formula client-side. If the advertised HP doesn't match the spawn, something has drifted — file a bug. The original picker bug, where Ancient Dragon advertised "10M" and spawned at 4.9M, was fixed in May 2026 by mirroring the server formula client-side.
The five bosses at a glance
Base HP, difficulty rating, and reward floor (at L10 alliance, 10 members — the formula's neutral baseline). Click through for per-boss guides where the overlay exists.
| Boss | Base HP | Difficulty | Weak to | Rewards @ L10×10 |
|---|---|---|---|---|
| Iron Colossus | 500,000 | Easy | Outmaneuver | 50,000 gold · 100 gems · 500 essence dust |
| Shadow Wyrm (overlay TBD) | 750,000 | Medium | Assault | 75,000 gold · 150 gems · 750 essence dust |
| Titan Guardian (overlay TBD) | 1,000,000 | Medium | Defend | 100,000 gold · 200 gems · 1,000 essence dust |
| Void Behemoth (overlay TBD) | 1,500,000 | Hard | Outmaneuver | 150,000 gold · 300 gems · 1,500 essence dust |
| Ancient Dragon | 2,000,000 | Legendary | Assault | 200,000 gold · 400 gems · 2,000 essence dust |
Live data — alliance level, current spawn timer, and the weekly-spawn counter — lives on the bosses reference, which pulls from the services API. These guide pages stay static (and patch-resilient) by covering only the mechanics that don't shift between balance patches.
How to pick which boss to spawn this week
Two spawns per week per alliance. The two-and-done cap is hard; even officers can't bypass it. Spend them on:
- The hardest boss you can clear. Rewards scale with the boss's base HP. A successful Ancient Dragon clear pays 4× an Iron Colossus clear. If you're confident you can win, push up.
- Not a stretch you'll likely lose. Wins multiply rewards 1.3×; losses multiply 0.7×. A successful Easy clear yields more than a failed Hard attempt at the same alliance level. The math punishes over-reaching.
- What your weakness reads. Each boss has a single weakness type (Outmaneuver / Assault / Defend). If your active comp leans into that combat approach, the boss is easier than its difficulty rating suggests.
Per-boss guides
Iron Colossus guide
The alliance starter raid. 500K base HP, Outmaneuver weakness. Where new alliances learn the spawn-and-clear cadence.
Ancient Dragon guide
The 2M-HP Legendary capstone. Highest reward floor, hardest clear. Assault-weakness comp planning required.
Shadow Wyrm, Titan Guardian, and Void Behemoth overlays are queued. Until they ship, the at-a-glance table above + the bosses reference cover the basics.
Common mistakes
- Spawning a boss your alliance can't clear in time. Bosses lapse if they aren't killed. You burn one of your two weekly spawns and get nothing.
- Ignoring the weakness column. "Weak to Assault" isn't flavor text; it materially changes how much damage your comp lands. Read it before you spawn.
- Picking by base HP alone. A 500K-HP boss with your wrong weakness type is harder than a 750K-HP boss aligned with your comp. The HP scaling formula isn't the whole story.
FAQ
How is alliance world boss HP actually calculated?
Server-authoritative formula: base_hp × (1 + alliance_level × 0.15) × max(member_count / 10, 0.5). The picker UI runs the same formula client-side so the advertised HP matches what spawns — fixed in May 2026 after the picker had been advertising '10M' for fights that spawned at 4.9M.
How many bosses can my alliance spawn per week?
Two, alliance-wide. Resets Monday 00:00 UTC. Only leaders and officers can trigger a spawn, and only one boss can be active at a time. Choose your two carefully.
What's the difference between these guide pages and the bosses reference?
The /wiki/bosses reference is data-driven from the services API — it shows live stats, families, and phase data. These guide pages are hand-curated overlays focused on how to actually beat each boss: comp recommendations, common-loss reasons, when to skip and come back.
Does losing a fight lock me out?
No, but it costs you reward multiplier. Wins multiply rewards by 1.3, losses by 0.7. A neutral outcome stays at 1.0. The boss persists between attacks until you kill it or it lapses, so a loss just means coming back with a better comp.