To promote Mason from an SSR hero to a golden UR hero in Last War, you must raise him to a full 5-star SSR rank and your server must reach Season 1 (The Beginning of Disaster). Once promoted, Mason's rarity increases to UR, but his star rating resets to zero stars, requiring gold universal UR shards or specific UR Mason shards for any future star upgrades.
Prerequisites for Mason's UR Promotion
The promotion interface remains locked until two specific conditions are met:
- 5-Star SSR Rating: Mason must have all five SSR stars and their associated inner progression nodes completely filled. You cannot initiate the promotion at 4 stars or partial node completion.
- Season 1 Server Milestone: The feature unlocks when your server enters Season 1: The Beginning of Disaster.
Because purple SSR shards appear regularly in Recruitment, event milestones, and the Campaign Store, build Mason to 5-star SSR using purple shards before Season 1 begins. Mason's promotion converts his existing SSR rank rather than consuming base building resources, but raising his level, skills, and equipment afterward requires standard Hero EXP, Gold, and tank gear.
The Promotion Reset and Stat Changes
Activating the promotion changes Mason's rarity frame from purple (SSR) to gold (UR) while immediately resetting his star level from 5-star SSR to 0-star UR.
| Metric | Pre-Promotion (SSR) | Post-Promotion (UR) |
|---|---|---|
| Rarity Tier | SSR (Purple) | UR (Gold) |
| Star Rating | 5-Star Maximum | 0-Star Base |
| Stat Growth | Capped SSR Base | Scaled UR Base |
| Upgrade Shards | Purple SSR Shards | Gold UR Shards |
| Troop Capacity | SSR-Tier Scaling | UR-Tier Scaling |
Although the star count resets to zero, Mason's base stat multipliers increase, allowing his offensive scaling and damage output to exceed his previous SSR limits. Additionally, his troop capacity scaling improves with his UR status, expanding your march size.
The critical mechanical shift occurs in shard consumption: Mason can no longer use purple SSR shards after promotion. Every subsequent star upgrade requires gold UR shards.
Shard Allocation and Squad Setup
Because promoting Mason resets him to zero stars, evaluate your universal UR shard budget before spending heavily to rebuild his star rating.
- Do not use universal UR shards before promotion: Bring Mason to 5-star SSR solely with purple shards and tavern recruitment.
- Prioritize primary UR damage dealers first: High-priority attackers such as Kimberly generally offer greater returns on universal UR shards.
- Target 3-star UR as a baseline milestone: Reaching 3-star UR restores Mason's baseline combat efficiency without entirely depleting your UR shard supply.
- Use seasonal reward chests: Supplement Mason's star upgrades with Season 1 event crates and designated rewards.
In combat, UR Mason functions as a backline physical damage dealer. In a standard 5-tank formation, place defense heroes such as Murphy and Carlie (or Violet) in the front row to absorb damage, while Kimberly, Marshall, and UR Mason occupy the back row. This setup activates the 20% mono-type tank attribute bonus, pairing Mason's physical skill volleys with Marshall's squad-wide damage amplification.
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Player Comments
157 players commented on this guide.
This helped me understand strategy much better.
The explanation is clear, especially for beginners.
Nice guide. I am checking the other Last War articles next.
I wish I had read this before upgrading the wrong thing.