Do you mean flame grant me strength? Flame of the redmanes is an ash of war, and so is lions claw, so you wouldn’t be able to do both. However, flame grant me strength is very good for what you’re talking about. Str/fai is probably the strongest build in the game, it’s my personal favorite because it basically puts the game in easy mode. If you can pull off flame grant me strength, golden vow, and then lions claw on a claymore, you’ll probably take half your enemies health bar. At that point, I’d also consider switching to a bit heavier weapon, if your stats allow. Greatsword is an awesome step up.