Magical oil poured over the body and smeared: 1d4+1
Potions and Oils is not disrupted by successful hit, damage, or failing a saving throw, but the container holding the liquid can be smashed before it is imbibed or applied. (Sage Advice #214 p. 78)
Gain the potential to brew potions at 9th level (PHB p. 43 / DMG p. 117)
Potions are primarily the province of wizards, although healing and curing potions are beyond the ken of wizards (DMG p. 119)
Require a complete alchemical laboratory (DMG p. 120)
Priests
Gain the potential to brew potions at 9th level (DMG p. 117)
Can prepare potions related to healing and cures (DMG p. 119)
Require an altar specially consecrated to the purpose of brewing potions (DMG p. 120)
Druids
Druids who spends 3 slots in the Herbalism nonweapon proficiency can create magical herbal brews (The Complete Druid's Handbook p. 103)
Dusts, Powders, and Solvents
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Dust initiative and disrupt information
Miscellaneous magical items have an initiative modifier: +3, unless stated otherwise (PHB p. 125 / DMG p. 79)
Miscellaneous magical items do not require concentration and therefore usually cannot be disrupted (Sage Advice #157 p. 25 + Sage Advice #214 p. 78)
Miscellaneous Magical Items
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Miscellaneous magical items initiative and disrupt information
Miscellaneous magical items have an initiative modifier: +3, unless stated otherwise (PHB p. 125 / DMG p. 79)
Rings, weapons, armor, and miscellaneous magical items generally have very short command words and therefore usually cannot be disrupted (Sage Advice #157 p. 25 + Sage Advice #214 p. 78)
Fabricating Magical itemsWizards
Gain the potential to create other magical items at 11th level, if he has the spells (DMG p. 117)
Priests
Gain the potential to create other magical items at 11th level (DMG p. 117)
Rods, Staves, and Wands
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Rod, Stave, and Wand initiative and disrupt information
Rods, Staves, and Wands have the following initiative modifiers unless the item description says otherwise (PHB p. 125 / DMG p. 196)
Rod: +1
Stave: +2
Wand: +3
If the optional command word rule is in use:
The majority of rods, staves, and wands can be disrupted. If rod, stave, or wand use is disrupted, the appropriate charges are expended and lost. (Sage Advice #157 p. 25)
Some rods, staves, and wands that are usable by non-spell-casters cannot be disrupted. (Sage Advice #157 p. 25)
If the optional command world rule is not in use, then rods, staves, and wands cannot be disrupted.