What this spell would do is basically Boost the damage you do by 1.5-2x, knockback you deal by 2-3x, and make you take 50% Knockback and damage for the next 10 seconds, But when it wears off you deal 75% damage,take 2x more kb and get mining fatigue 2 for 30 seconds. This is meant to be used as a last resort if your about to die but happen to come across this super rare Book. This book would be as rare as The Knockback Nemo and only come from mid emerald ores.
The description could be something like “Gain An Immense Amount Of Power For 10 Seconds But With A Major Setback For The Next 25 Seconds After This Wears Off.”
Tell me what ya think!