If Warwick Hunter Champion (with 'kill all damaged enemy units here' ability) is killed by Hidden Blade in response to his attack declaration, does his ability still kill a damaged Caitlyn on the battlefield?

Ruling: Warwick dies and Caitlyn lives. When Hidden Blade (a reaction spell) resolves first and kills Warwick, his ability still triggers but fails to resolve because it cannot find the "here" information it needs after Warwick has left the battlefield.

Sequence:

• Warwick declares attack, triggering his ability
• Opponent plays Hidden Blade (reaction spell) in response
• Hidden Blade resolves first, killing Warwick
• Warwick's ability attempts to resolve but fails because Warwick is no longer on the battlefield and the ability cannot find "here"
• Caitlyn survives

Nuances:

• Unlike Magic: The Gathering, Riftbound has no "Last Known Information" rule - if an object leaves the zone it was expected to be in, effects that reference it fail to find the needed information
• The ability does go on the stack/chain, but it fails to resolve properly rather than being removed from the stack