Operator overview: Kroos the Keen Glint
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Kroos the Keen Glint is the alternate 5★ version of Kroos who specializes in DPS and the welfare Operator of Invitation to Wine, awarded by completing the Escort Duty mission which requires them to clear IW-5 with 
Kroos the Keen Glint's Token available in Xingyu Inn for 200 
, 240 , 280 , 320 , and 360 .
Being an alternate Operator, the Keen Glint is subject to the following mechanics:
- Both Kroos and Keen Glint shares the same Trust, but have different Potential, skills (as well as separate skill upgrades/Specialization training), talent, and base skills (as well as separate morale).
- Both Kroos and Keen Glint have their own outfits and dialogues, and are available separately as the player's Assistant.
- Both Kroos and Keen Glint can be present in one squad or the RIIC at the same time.
The Keen Glint is identical to Kroos in all but stats which is much higher due to her rarity, which also allows her to be promoted to Elite 2 unlike Kroos. Notably, the Keen Glint's DP cost is one of the highest of Marksman Snipers before her Potential is accounted for.
Talent
Similar to the original Kroos' Targeting - Primary, Bullseye gives the Keen Glint's attacks a chance to deal more damage and briefly Stuns the target.
Skills
- Traceless has offensive SP recovery, which slightly buffs the Keen Glint's ATK and makes her attack in two-shot bursts in addition to camouflaging her while active.
- Silencer reduces the Keen Glint's attack interval and makes her attack in two-shot bursts while active; if she managed to land 40 (36 at Specialization Level 1 and 2, 32 at Specialization Level 3) hits with her attacks, the Keen Glint will attack in four-shot bursts instead for the rest of Silencer's duration.
Operator Module
The MAR-X Module, Truth or Dare, increases the Keen Glint's ATK against aerial enemies to 1.1× in addition to increasing her maximum HP and ATK. Once upgraded, Bullseye's critical damage is increased.
Base skills
- Alternate Personnel has Operators in the Control Center (including the Keen Glint herself) recover 0.05 morale per hour for every alternate Operator (also including the Keen Glint herself) there while the Keen Glint is assigned to the Control Center, which stacks with other similar base skills (including itself!).
- Combat Techniques: Marksman speeds up the skill Specialization training of Snipers by 30% while the Keen Glint is assigned as the trainer in the Training Room; if the trainee is a Marksman Sniper, the Specialization training will be sped up by 45% instead.
Summary
Kroos the Keen Glint is a solid Marksman Sniper who performs even better than Kroos and is quite comparable to other Marksman Snipers of the same rarity, so expect that players will use Keen Glint more often than Kroos in most situations. Kroos truly had grown like a fine wine; the older the better... but at what cost?