How do hit dice work? My character has 4d8.

Typically on a short rest you can roll a number of them to regain health. Constitution modifier is included for each dice expended. Hit dice are regained at long rest.

This item lets you get max from each hit die spent, while under its effects. 

Quote from burninGod >>

How do hit dice work? My character has 4d8.

 https://www.dndbeyond.com/sources/basic-rules/step-by-step-characters#HitPointsandHitDice

https://www.dndbeyond.com/sources/basic-rules/step-by-step-characters#HitPointsandHitDice

In my world, the inventor of this concoction is named Robbi Tussin, Life Domain Cleric. :-)

So, Poison of Virality would inflict exhaustion & give you an infectious disease, right? 

Quote from burninGod >>

How do hit dice work? My character has 4d8.

 So, your hit dice is a d8, and because you are at 4th level you have access to 4 of those. Each level you gain adds 1 more hit die to your character's "pool" (a level % character would have 5d8, a level 6 would have 6d8 and so on).

When determining how much health you regain during a Short Rest, you have 4 "hit dice" that you can roll. You can use just one of them, 2 of them, 3 of them or all 4, but no more than that until you get to level 5 and so on.

The way to get them back after using them is by Long Resting where you can regain half of the total number used in the previous Short Rest. So if you used 2 during a short rest, you'd regain 1 at the next long rest. If you only use 1 though, you'll still regain 1 hit die because you wouldn't regain 1/2 a hit die. That would be silly.

Of course, your DM can decide to adjust these rules if they want but that's how they work normally as far as I understand

The way to get them back after using them is by Long Resting where you can regain half of the total number used in the previous Short Rest. So if you used 2 during a short rest, you'd regain 1 at the next long rest. If you only use 1 though, you'll still regain 1 hit die because you wouldn't regain 1/2 a hit die. That would be silly.

Quote from ProphetZarquon >>

So, Poison of Virality would inflict exhaustion & give you an infectious disease, right? 

 

 the opposite

What's the price on these things?

my berseker barbarian love this potion

Wait this item would remove any exhaustion.. so if you feed this Tina creature with 5 levels.. it's nuts filled normal again?