Gleason's Gielinor Guide

1 dose2 dose3 dose4 dose
Forgotten brew(1)

Released							11 January 2023 (Update)
Members							Yes
Quest item							No
Properties
Tradeable							Yes
Equipable							No
Stackable							No
Noteable							Yes
Options							Drink, Empty, Drop
Examine							1 dose of forgotten brew.
Values
Value							50 coins
High alch							30 coins
Low alch							20 coins
Weight							0.035 kg
Grand Exchange
Exchange							1,255 coins (info)
Buy limit							-
Daily volume							322
View real-time prices
Advanced data
Item ID							27638
Link							MOID

A forgotten brew is a potion made by using 20 ancient essence per dose on an ancient brew, requiring 91 Herblore and giving 36 Herblore experience per dose (145 for a 4-dose potion) in the process.

A dose of forgotten brew boosts the player's Magic level by 3 + 8% of their base Magic level, as well as restoring prayer points equal to 2 + 10% of their base Prayer level (with the ability to restore up to 5% over the player's base Prayer level). However, it will also drain the player's Attack, Strength, and Defence levels by 2 + 10% of their current levels.

Effects

Magic boost

Magic boost is calculated with: ⌊MagicLevel×8100⌋+3

Stat boosts will decay at a rate of 1 point per minute, or 90 seconds with the use of Preserve.

Level	Boost	Level	Boost
1-12	+3	50-62	+7
13-24	+4	63-74	+8
25-37	+5	75-87	+9
38-49	+6	88-99	+10

Prayer restore

Prayer restore is calculated with: ⌊PrayerLevel×110⌋+2

Level	Boost	Level	Boost
1-9	+2	50-59	+7
10-19	+3	60-69	+8
20-29	+4	70-79	+9
30-39	+5	80-89	+10
40-49	+6	90-99	+11

Stat Drain

Temporarily decreases Attack, Strength, and Defence by ⌊Level×110⌋+2

Stat drains will restore at a rate of 1 point per minute, or 2 per minute with the use of Rapid Restore. They can also be recovered with the use of a Super restore.

Level	Boost	Level	Boost
1-9	-2	50-59	-7
10-19	-3	60-69	-8
20-29	-4	70-79	-9
30-39	-5	80-89	-10
40-49	-6	90-99	-11

Creation

Requirements
Skill		Level	XP
Herblore		91 ^(b)	36
Members		Ticks	3 (1.8s)

Materials
Item		Quantity	Cost
	Ancient brew(1)	1	836
	Ancient essence	20	360
Total cost			1,196
	Forgotten brew(1)	1	1,255
Profit			59
Profit after GE Tax			34

Requirements
Skill		Level	XP
Herblore		91 ^(b)	72
Members		Ticks	3 (1.8s)

Materials
Item		Quantity	Cost
	Ancient brew(2)	1	1,424
	Ancient essence	40	720
Total cost			2,144
	Forgotten brew(2)	1	2,607
Profit			463
Profit after GE Tax			411

Requirements
Skill		Level	XP
Herblore		91 ^(b)	108
Members		Ticks	3 (1.8s)

Materials
Item		Quantity	Cost
	Ancient brew(3)	1	2,041
	Ancient essence	60	1,080
Total cost			3,121
	Forgotten brew(3)	1	3,006
Profit			−115
Profit after GE Tax			−175

Requirements
Skill		Level	XP
Herblore		91 ^(b)	145
Members		Ticks	3 (1.8s)

Materials
Item		Quantity	Cost
	Ancient brew(4)	1	3,090
	Ancient essence	80	1,440
Total cost			4,530
	Forgotten brew(4)	1	3,565
Profit			−965
Profit after GE Tax			−1,036

Price Per Dose

Item	GE price per potion	GE price per dose	GE volume
Forgotten brew(1)	1,255	1,255	322
Forgotten brew(2)	2,607	1,304	546
Forgotten brew(3)	3,006	1,002	517
Forgotten brew(4)	3,565	891	27,471

Trivia

When pitched in the poll blog, the item's name was "Magister's brew". This was because the name of the quest and its rewards were polled by the development team as a "Mysterious Quest", where they wished to keep the Zarosian nature of the rewards a secret.
- The true name of the quest and its rewards from the boss were then revealed in the Winter Summit 2022 a month later.