Overview
This is a high-budget Cast on Crit setup built on the Gemling Legionnaire, pairing Comet as the heavy-hitting payload with Arc as the trigger-feeding filler. The Gemling ascendancy is the anchor: its gem-quality and attribute scaling let the build run an oversized support configuration that a normal Mercenary could never sustain, which is what makes the Cast on Crit chain fire reliably enough to be a full-time clear tool rather than a gimmick.
The creator frames it explicitly as an endgame and high-budget project, not a starter. The gear list walks through a wand, a ward slot, gloves, Headhunter, boots, Temporalis, ring, amulet, helmet, flask and charm, plus a chest swap. Several of those are chase items that gate the build behind a substantial investment. The payoff is a build that runs a fully-formed Expedition farming setup and holds up in high-tier mapping.
Structurally it is a Spirit-driven configuration: the video devotes a dedicated segment to Spirit budgeting before the gem setup, which signals that reservation math, not raw damage, is the real constraint being solved for.
Pros & Cons
Pros
- Gemling gem scaling supports a much denser support setup than the class norm
- Comet delivers large burst payloads while Arc keeps the crit-trigger chain fed
- A dedicated Expedition setup is covered in the source, so the build has a defined farming outlet
- Chest-swap flexibility allows retuning between clear and durability
- Scales cleanly with budget, so extra investment translates directly into throughput
Cons
- Explicitly a high-budget build; Headhunter and Temporalis are not casual acquisitions
- Cast on Crit chains add real complexity to gearing and Spirit budgeting
- Not a league-start option, since the setup assumes an established character and currency pool
- Screen density from Arc plus Comet can make dangerous ground effects hard to read
Key Skills
- Comet — the primary damage payload, triggered rather than hard-cast
- Arc — the fast-hitting filler that drives crit frequency for the trigger chain
- Cast on Crit — the mechanical core linking the two together
- Gemling Legionnaire ascendancy passives — the gem and attribute scaling that makes the support density possible
Gear & Anointments
The build runs a wand as its weapon and leans on a named chase-item core: Headhunter and Temporalis both appear as dedicated gear segments in the source. The remaining slots (ward, gloves, boots, ring, amulet, helmet, flask and charm) are covered individually, along with a chest swap for situational retuning, jewels, and a full skill tree pass. Exact mods and the anointment choice should be confirmed against the source video and the linked build planner, which carry the current numbers.
Endgame Notes
The source closes with an Expedition-specific configuration, positioning Expedition as the intended endgame farming loop alongside general high-tier mapping.
Credits & Source
Build credited to NickTew. See the source video for the full build’s gameplay footage and voice commentary: BEST Gemling Build Guide CoC Comet+Arc | Endgame & High Budget PoE 2 0.5.