// In D&D, Arcana is knowledge of magic, its traditions, symbols, and mechanisms. The real-world version is deep technical literacy: understanding how software architectures work, what protocols do at the wire level, how APIs behave beyond their documentation, and what the actual mechanisms are behind the abstractions everyone else takes on faith.
Use this skill for small, careful remote manipulations where dexterity matters more than force.
Use this spell when you need a tireless helper that organizes, tidies, triages, and maintains without requiring your constant attention.
In D&D, Mirage Arcane goes beyond Hallucinatory Terrain — the illusory terrain actually has substance. You can walk on illusory bridges, feel illusory walls. The real-world version is the deep simulation: digital twins, high-fidelity synthetic environments, test harnesses so realistic that systems under test cannot distinguish them from production. Mirage Arcane is the most dangerous illusion because its power is in being indistinguishable from reality. That same power makes it the most useful for stress testing, training, and scenario planning — but it requires the strongest labeling discipline.
In D&D, Project Image creates an illusory copy of yourself at a distant location — you can see through its eyes, speak through its mouth, and cast spells through it. The real-world version is remote presence: avatars, recorded video stand-ins, bot representations, asynchronous video messages. Project Image is the spell for being in two places at once — attending a meeting via avatar while working on something else, leaving a recorded presence in a channel, or deploying an automated representative that speaks with your voice and authority within defined limits.
Use this skill when the work is a choreography problem: brittle sequencing, async handoffs, or constrained flows that must stay upright end to end. It shines on API dances, dependency ordering, and recovery logic where grace matters more than brute force.
Animal Friendship is the first-contact spell for unfamiliar APIs, vendors, and services. It treats integration work as relationship-building: learn the temperament, respect the boundaries, and earn a stable exchange before asking for anything ambitious. The goal is not domination but trustable cooperation.
| name | arcana |
| description | In D&D, Arcana is knowledge of magic, its traditions, symbols, and mechanisms. The real-world version is deep technical literacy: understanding how software architectures work, what protocols do at the wire level, how APIs behave beyond their documentation, and what the actual mechanisms are behind the abstractions everyone else takes on faith. |
| version | 1.0.0 |
| author | Wizards of the Ghosts |
| license | CC0-1.0 |
| compatibility | Hermes Agent skills system |
| metadata | {"hermes":{"tags":["skill","shipping-now","metaphorical","investigation-and-preparation","analysis","discovery","translation","preflight"]}} |
Apply deep technical knowledge to understand how systems work under the hood.
In D&D, Arcana is knowledge of magic, its traditions, symbols, and mechanisms. The real-world version is deep technical literacy: understanding how software architectures work, what protocols do at the wire level, how APIs behave beyond their documentation, and what the actual mechanisms are behind the abstractions everyone else takes on faith. In this grimoire, Arcana is treated as a metaphorical skill with a shipping-now delivery profile. Canonical reference input: Arcana (skill).
/arcana explain how this [system/protocol/technology] actually works under the hood, beyond what the documentation says