Regeneration Stones

Draemony's "potions": Life and Mana stones in seven sizes.

Instead of potions, Draemony uses Regeneration Stones: gear that takes two dedicated slots, the Life Stone (1 key) and the Mana Stone (2 key).

Each use spends charges and restores over a few seconds. Back-to-back uses stack.
There are seven sizes. Bigger stones restore more, but take longer and give fewer uses per full charge. The choice is yours.
Charges come back with kills and refill whenever you reach a town.
The Life Stone also removes Bleeding.
Stones can roll their own affixes (effects that only apply while the stone is working), and belts, passives and some quests increase their charges.
They drop from monsters (more often from bosses) and are sold by magic vendors. The Abyssal size only drops.

All stones

Stone	Level	Restores	Time	Charges	Cost	Per kill
Cracked Life Stone	1	700	2 s	30	10	1.6
Small Life Stone	8	1,300	2.3 s	36	12	1.9
Medium Life Stone	15	1,800	2.6 s	42	14	2.2
Large Life Stone	21	2,450	3 s	45	18	2.6
Superior Life Stone	34	3,850	3.4 s	54	18	2.9
Ancestral Life Stone	48	5,500	3.8 s	60	20	3.2
Abyssal Life Stone	64	8,100	4.2 s	66	22	3.5
Cracked Mana Stone	1	70	2.5 s	30	10	1.6
Small Mana Stone	8	100	2.8 s	36	12	1.9
Medium Mana Stone	15	130	3.1 s	42	14	2.2
Large Mana Stone	21	165	3.5 s	45	18	2.6
Superior Mana Stone	34	210	3.9 s	54	18	2.9
Ancestral Mana Stone	48	260	4.3 s	60	20	3.2
Abyssal Mana Stone	64	320	4.7 s	66	22	3.5