Underworld Build Craft

Build craft is the heart of Reap and Rush — a Steam action roguelike (地府有点忙) often compared to Magicraft, but with Five Elements resonance, underworld duties, and Envoy starters shaping every run. This hub links specialized guides for each system and explains how pieces fit together before you enter the Build Planner or compare power on Tier Lists.

The four pillars

Fate Stones passively define your run — stats, tags, and odd rules. Yin Spells are your active damage and control. Paper Crafts burst windows and solve elites. Five Elements (Metal, Wood, Water, Fire, Earth) tie all three together via Resonance breakpoints. Neglect one pillar and runs feel fine until biome two; neglect synergy and biome three humbles you.

Start here: Fate Stones

Stones drop on level-up and from shops. They are the skeleton of your build. Read Fate Stone Builds for starter templates and Fate Stone Tier List for power ranking. Item stats and drop notes: Fate Stones Items.

Layer active power: Yin Spells

Spells upgrade on level bars filled by Souls. Cooldown loops beat raw damage early. Yin Spell Builds covers archetypes; Yin Spell Tier List ranks single-target vs area. Item reference: Yin Spells Items.

Burst windows: Paper Crafts

Crafts are tactical, not spammable. Boss phases and elite packs are craft moments — not trash waves. Paper Craft Builds and Paper Crafts Items detail slots, animations, and freeze tech.

Resonance capstone: Five Elements

Three matching element tags trigger Resonance — a visible pulse and stat spike. Full resonance builds dominate Late Early Access; hybrid builds learn mechanics faster. Deep dive: Five Elements Builds (featured video guide inside).

Envoys, Companions, Relics

Your Envoy pick biases starting tags. Companions and Relics fill gaps — sustain, pierce, duty rewards. Envoy Tier List, Companion Tier List, Companions & Relics Items.

Learning path

New players: follow Getting Started → Fate Stone build → Combat Basics → Planner experiments. Veterans: optimize resonance before boss pushes per Boss Guide. Track balance changes on Updates.

Run archetypes at a glance

Learner runs prioritize Water control and feeding duties. Farmer runs stack Earth duty bonuses and escort companions. Boss push runs force Metal or Fire resonance with craft burst windows. Collection runs chase relic blueprints and stone archive entries without caring about timer modifiers. Name your run type before opening the envoy select screen — random upgrade picks feel chaotic until you assign a goal.

Common build mistakes in Early Access

Chasing three different element tags before any resonance activates spreads your power too thin. Ignoring Paper Crafts leaves boss phases feeling unfair when stagger windows exist — read Paper Craft Builds. Skipping duties forever starves meta Souls needed for envoy roster depth on Envoy Tier List. Finally, copying tier lists without checking Updates after patches is the fastest way to feel nerfed.

Weekly build lab routine

Spend one evening testing a resonance element, one evening testing duty farming, one evening boss rushing. Rotate envoys so ledger unlocks stay balanced. Log which Fate Stone Items appeared most often — personal RNG bias beats abstract tier labels when planning Build Planner sessions.

Build craft closing notes

Early Access rewards players who document one working resonance per element before chasing optimized tier lists. When Beijing Pacifier Technology patches stone pools or spell forks, we update Updates first — then Builds Hub child pages. Keep a ten-run log: envoy choice, third-tag timing, boss craft used, duties finished. Patterns emerge faster than copying highlight clips without context. Cross-link every run goal to Underworld Duties or How to Beat Bosses so power spikes have a purpose.