New MPA Builder covers motions, oppositions, replies, and briefs, completing Legion’s end-to-end litigation suite as users report up to 27% reductions in staffing costs.

 

SAN JOSE, CA — Legion, the AI drafting platform built exclusively for California litigators, today announced the launch of its MPA Builder. The new tool transforms raw case files into court-ready motions, oppositions, replies, mediation briefs, and ex parte applications in minutes. This release extends Legion’s capabilities beyond pleadings and discovery to cover the full lifecycle of a litigated matter.

The launch comes as real-world results from Legion’s early adopters validate the company’s core thesis: thoughtfully implemented AI simultaneously reduces costs, increases profits, and makes legal services more accessible.

 

From Staffing Crisis to Strategic Advantage
When Ad Astra Law Group, a six-attorney litigation boutique in San Francisco, lost its eighth-year associate in mid-2025, Managing Partner Katy Young made an unconventional call. Rather than hiring a replacement, she turned to AI.

The results, recently documented in a Legion case study and covered by Above the Law, were striking. Within months, Ad Astra reported a 27% reduction in staffing costs alongside higher profitability, increased referrals, and an expanded ability to take on smaller matters that previously lacked economic viability.

The efficiency gains were concrete. Complaints requiring eight hours to draft dropped to two and a half. In one instance, Young used Legion to generate 40 sets of discovery — roughly 950 requests across a complex multi-defendant case — in two days. She estimated that workload would normally require two full weeks from an associate.

Beyond the financial metrics, Young points to a fundamental shift in her daily experience practicing law:

“I actually get a little giddy when it’s time for me to go use one of these tools… It pops out a set of special interrogatories and I’m like, yay!”
— Katy Young, Managing Partner, Ad Astra Law Group

 

The Final Puzzle Piece: The MPA Builder
For Legion Co-founder Zihao Jiang, Ad Astra’s success with early drafting tasks created a clear mandate to tackle the most complex phase of litigation: motion practice.

“Firms are using our platform to entirely restructure their practice models. A firm can move away from charging $5,000 for a complaint that takes eight hours to draft, and instead offer a flat $2,000 for work that takes 30 minutes. The lawyer maintains strong margins, the client can actually afford to pursue their case, and the firm builds a bigger book of business at higher volume. With the MPA Builder, firms can now apply those exact same economics to their motions and trial briefs.”
— Zihao Jiang, Co-founder, Legion

Young echoes this view from the practitioner side. She acknowledges that AI reduces per-project billing hours, yet the downstream effects heavily compensate. Clients appreciate the cost reduction, referrals have surged, and the firm can confidently accept cases they previously had to turn away.

“Although each project takes me less time and is ultimately less billing at the beginning, what I’m getting is a bigger book of business. If you look at it over the long view, our profits are way up.”
— Katy Young

About the MPA Builder
The new MPA Builder follows the same intuitive workflow as Legion’s Complaint and Discovery tools. Attorneys upload raw case materials, including emails, contracts, deposition transcripts, and prior filings. Legion analyzes the documents, identifies relevant legal arguments, and generates a complete, formatted draft ready for attorney refinement using plain English commands.

Supported document types include:

  • Motions (all types)
  • Oppositions and replies
  • Mediation briefs
  • Trial briefs
  • Ex parte applications

With the addition of the MPA Builder, Legion now supports every major drafting task in a California litigator’s workflow from the initial complaint through trial.

Availability
The MPA Builder is available now to all Legion users. For more information or to book a test drive, visit legion.law.

About Legion
Legion is the AI drafting platform built exclusively for California litigators. The platform enables law firms to accelerate the entire drafting process across pleadings, discovery, and motions. By automating the production of polished, court-ready documents under attorney supervision, Legion allows practitioners to focus on high-level strategy and client advocacy.

Media Contact
Zihao Jiang
Co-founder, Legion
zihao@legion.law
legion.law