Do any buffs stack with the warrior skill 'Eviscerate'?

[LolRip]

I'm running a duel-wielding paladin/spell caster type build (Had to save edit two sanctified gladius' for extra RP) and I realised that even with the bonus damage from 'Charge weapon' my eviscerate was still averaging about 15-20 damage per strike which (not including crits which leave it at around 50) so I was just wondering are there any buffs that boost the damage or is the skill just built that way

 

[LolRip]

By some stroke of irony, this happened not too long after my post, so I'm not quite sure what I did

 

[Kingu2]

this skill comes with -50 atk power and relies heavily on crits for most of the damage. what you could do is have ryn give you the blessed buff to negate the damage penalty before using it.