Perdition
A player discussion describes Perdition as increasing Crossblade flight speed and restricting its placement to the Crossblade.
How it works
A Steam discussion lists Perdition among enhancements used on the KotV weapons and describes its effect as increased Crossblade flight speed. The post explicitly says it can only go on the Crossblade. The passage does not state how much flight speed changes or provide upgrade-path details.
When it helps
If using Perdition, the discussion says it can only be socketed into the Crossblade.
Read the supporting references
A source-bounded reference to six named weapons, four Hollow-specific Wrath effects, and named enhancement effects. It records stated weapon functions and damage progressions, plus enhancement effects, conditions, and restrictions. It does not establish an optimized build, comparative ranking, complete acquisition guide, or comprehensive DLC equipment coverage. Guidance explains the referenced mechanics; it is not a tested damage ranking. Check the stated edition and source version before applying a patch-specific detail.