Final elixir

Final Elixir is the strongest potion available in runescape. As with all potions it is made with the Herblore skill. A herblore level of 145 is required to create the potion and since the potion is tradeable unlike overloads or extremes, however it is far more expensive.. They provide and extremely high boost to a players Attack, Strength, Defence, Magic, Ranged and Constitution. By making the potion the player will receive 20000 Herblore exp.

This potion is created using Perfect Overload, Ultimate Adrenaline Potion, Ultimate Restore Energy, Sanfew Serum, Antipoison++, Ultimate Prayer, Ultimate Restore Potion, Ultimate (?) Antifire, Ultimate Poison Weapon and Prayer Renewal to be combined, leaving 9 empty vials behind. When used, it restores your LP by 2100 + 15% of LP (can increase 15% LP max limited time), restores 100% of your energy,  restores 100% of the adrenaline bar, restores reduced stats by 13 + 45% of stat levels, boosts combat stats by 12 + 39% of combat skill level (150 base will be 210 temporary boost), boosts 10 + 10% of Resource, Production & Support skills beyond maximum, restores Summoning (by 13 + 45% of summoning level, can restore and boosts maximum) and prayer (by 3.43 times the player's Prayer level plus 70, can restore and boosts maximum, also it can regenerate 4 times the player's Prayer level plus 120 but cannot boost it maximum while prayer-regenerating) complete immunity of poison, disease and dragonfire, prayer regen, etc. Lasts 15-30 minutes but has 5 minute cooldown after each use, stacks and works with Berserker or Rapid Regeneration Prayer. Works well in unsafe PK, safe minigames and as such. Also, it gives you 12-70 levels - damage (all melee, ranged and magic) boost is +36-211.5% from Final Elixir.

To make it stackable, you must get any SE Vial and SE Flash, if you have 5/6 FE Flask and 3/4 FE Vial, it will be Repeatable Final Elixir (8), removing all vials and flasks from NPC Secret Alchemist. The best way is that you have all 28 Final Elixir Flasks in your inventory and 30 in Pack Yak, then it will be 348 Repeatable Final Elixirs in your inventory, leaving all but 1 inventory and Pack Yak's BoB empty. This behaves like Purple Sweets or Biscuits.

This effect stacks with Holy Wrench and Reverence Aura and LP recovery boosting amulet.