[Exxy]

I don't see why a buff that affects damage scaling, and is removed if you use it to break through a Guarding player, means we have to shy away from this.

Lance de Lion is another Guard Break skill in this class promotion and comes with it's own downsides (mainly due to the high FP cost and you're unable to move in the turn you use it),

Light Tomahawk has poor scaling compared to other Guard Break Skills, doesn't proc -after- the Break like other Skills, is a percent chance unless max rank (which requires 5/5 SP and a Quick-Time Event to successfully trigger).

Reaper Scythe could possibly do with receiving a damage-applied-after-break (possibly like Light Tomahawk could as well, just slightly different reasoning) to make up for it using up your Claret Call (compared to the 500 damage possibility if you flank the enemy's back); seeing as applying Reaper Scythe and then attacking, spending the buff in the process, is still in a fairly worse spot than Lance de Lion.

As for Libergrande, I'm uncertain on how to talk about it as I've rarely (if ever) used it. . . but I believe it's a Summoner Class Sync-Mind Skill (or Install, I honestly can't remember) or some such? If you have some qualms with it please be more specific about the issue it'd cause.