RuneScape Classic Wiki
RuneScape Classic Wiki
The main RuneScape Wiki has an article on: Ultimate strength
The Old School RuneScape Wiki also has an article on Ultimate strength.
The RuneScape Classic Wiki
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Magic Prayers
Level 1: Thick skin
Level 4: Burst of strength
Level 7: Clarity of thought
Level 10: Rock skin
Level 13: Superhuman strength
Level 16: Improved reflexes
Level 19: Rapid restore
Level 22: Rapid heal
Level 25: Protect items
Level 28: Steel skin
Level 31: Ultimate strength
Level 34: Incredible reflexes
Level 37: Paralyze monster
Level 40: Protect from missiles
Level 31: Ultimate strength
Increases strength by 15%
Drain rate: 60

Ultimate strength is a Prayer you can use at level 31. It has a drain rate of 20 points per minute, and when activated it increases your Strength by 15% temporarily.