D&D Beyond offers the ability to link certain aspects on the forum in mouse-over triggered tooltips, such as magic items, monsters or combat actions - examples being Adult Black Dragon and dash.  To create tooltips in this way as these, use the appropriate [tag][/tag] around the desired subject.

These tooltips can be used in most text boxes on D&D Beyond, such as: forum posts; campaign notes section; homebrew descriptions.

Example: [magicitem]Sun Blade[/magicitem]

Use the following within the [ ][/ ] bracket system:

• action - an action taken in combat - e.g. dodge, search and ready
• condition - a condition afflicted upon a creature - e.g. restrained, poisoned and prone
• item - a mundane item - e.g. torch, trident and backpack
• magicItem - a magical item - e.g. Bag of Holding, Dust of Disappearance and Demon Armor.
• monimg - the image for a specific monster (if it has one)
• monster - a creature you can encounter - e.g. Banshee, Bandit and Unicorn
• rule - a rule of D&D - e.g. falling, heavily obscured and three-quarters cover
• sense - a type of extra sense, whether magical or natural - e.g. darkvision, tremorsense and truesight
• skill - this is used for professions - e.g. Persuasion, Stealth
• spell - a magical spell - e.g.  Mage Hand, Magic Missile and Abi-Dalzim’s Horrid Wilting
• wprop - a property of a weapon - e.g. finesse, versatile and heavy
• vehicle - a specific vehicle - e.g. rowboat

Additionally, tooltips support the written text of the tooltip being different from the actual item or monster text. This is great for plurals for example:

Ioun Stones of [magicitem]ioun stone of strength;Strength[/magicitem] and [magicitem]ioun stone of regeneration;Regeneration[/magicitem]
would display as:

"Ioun Stones of Strength and Regeneration"

[monster]Wolf;Wolves[/monster] displays as Wolves

Note: Tooltips do not function in the character sheet. If you create an item with a tooltip to Magic Missile, the tooltip will not be active in the character sheet.