Fun fact: while being an absolute powerhouse, General Grievous' relic ups his damage by 49%.
That's as much as Gar Saxon's relic.
And much less than B1's relic, which gives an impressive 75%. Grand Master Yoda's relic also gives a 75% additional damage.
Not that B1 or GMY give the absolute maximum increase in damage. Jedi Knight Anakin, for instance, gains 87% damage.
So... yeah. I don't really know. Many people seem to be upset with B1's relic giving "only" an increase of 75% while no mention is made of Grievous' relic giving "only" 49%. Then again, Grievous' damage output is much bigger than B1's even after the increase, but that's a problem that already existed before. They have different roles in the team, Grievous was already brokenly powerful, with relics he is still brokenly powerful, and relics were never promised to be objects to equalize the power level of every character.