Created as a joke by Eric Winterrobe a famous bard. This tea unintentionally became a very useful drink for those going into battle. The tea is made from small amounts of snake poison mixed with the blood of cave fishers and regular tea. Upon consumption users feel a strange out- of body feeling like one is looking inwards on oneself like an audience to their own actions. Along with this it has many beneficial effects for soldiers 

1. Invigorates the drinker as if under the hast spell 

2. Calms the drinker 

3. Reduces physical & emotional pain felt by 70% 

4. Increases reaction time (+3 on dexterity saving throws & checks) 

5. Increases survivability (+2 on constitution saving throws & checks & +1 Armor Class)

6. Advantage on death saving throws 

7. Immune to the stun effect’

See Cave Fisher from Mordenkainen’s Monsters Of The Multiverse (Pg. 73)