There are plenty to choose from, however the common ones I see people use are:
Raging Sun orbs (Also known as fire pots) - Good to add damage to attacks; popular amongst sins (Obtained in the forges near General Summers in archosaur. Cost is 1 Mystical Elixiers for 15 fire pots)
Iron Guards - No longer available form forges however makes you invincible for a short period of time (There is another version of these too from the same forge but it makes you unable to move)
Accuracy pots - not sure what it increases your accuracy by but this is popular amongst barbs due to their low accuaracy
Debuff pots - Instantly removes debuffs
Stealth detection pots - useful to detect those sneaky sins! not usable by sins though. Sins in shadow escape (The yellow one) are undetectable by other sins but these pots will help you find them if your level is high enough.
There are other common ones too however im not onlne to check them.
