Most of the elements describing the creature should be quite familiar. However, if they're not, here's what you should know:
The Attributes panel presents the creature's attack, defense and such. Position your mouse over an element to display the tooltip if you're not familiar with the icon.
The Economics panel shows the cost of the unit, and its weekly growth rate.
Move your mouse over the abilities to show the description popup.
Casters have a spellbook: it opens as a popup to show the creature's spells. The little icon next to the spell name represents the creature's mastery of that spell, ranked from None to Expert. Click on a spell to go to the corresponding spell page.
The Experience value is the amount of experience your hero will gain when killing one creature of that type.
The Power Rating is a global indicator of the creature power. It allows you to roughly compare different creatures, even if, of course, there's no such thing as a unique strategy and power ladder in Heroes 5!!
Fortress - Level 1
Defender
Comprising the backbone of any Dwarven army, the Defenders are the Stone Halls' most numerous troops. Bolstered by their tough Dwarven armour, Defenders can hold their ground against the attacks of enemies much mightier than they are.
Shieldguards are battle-hardened warriors whose mission is to protect other Dwarven units. Using their mighty shields, the Shieldguards can build an unbreakable wall to decrease the damage inflicted by the attacking enemy. The greater the distance is for the enemy to move before attacking, the weaker their blow will be.
Spearwielders are one of the Dwarven army's trump-cards. The shock of their attack and their skill with their heavy-bladed spears grant them a chance to decrease the enemy's Speed and Initiative.
Spearwielders who master the difficult art of throwing their weapon -- accurately -- become Skirmishers, able to strike the enemy from a distance. They are thus doubly effective, having both a ranged attack while inhibiting the enemy's Initiative and Speed. Like the Spearwielders, they remain dangerous in melee and are not penalised for their ranged attack skills.
No army can do without cavalry, whose object is to quickly reach and engage the enemy units. The Dwarves have tamed fierce bears for this, whose toughness and endurance compensate for their relatively lower speed.
Blackbear Riders are the Dwarves' elite mounted troops. Their mighty beasts wear heavy armour and are rigorously trained to have improved vitality. In addition, the black bears can go into a frenzy, striking the enemies with their paws and knocking them aside to decrease their Initiative.
The Brawlers are masters of hand-to-hand combat to the point where they disdain the use of weapons. they rely instead on ironclad gauntlets and the strength of their own limbs, which are sufficient to inflict heavy damage. So great is their dedication to their martial arts that they are immune to mind-affecting spells.
Berserkers are much like Brawlers, but armed with cruelly-bladed gauntlets. Berserkers may fall into a combat frenzy, losing some Defense but increasing theit Offense greatly. When this happens, the Berserker attacks any nearby creature without suffering retaliation.
The Rune Priests are a special caste among the Dwarves, recruited from children born with golden eyes -- the mark of their god, Arkath -- who are selected and brought up as battle-mages. They strike the enemy from a distance and have greater resistance to their foes' magical attacks. A Rune Priest can curse a target with the Mark of Fire, increasing the damage the target suffers from fire-related spells.
Certain highly-skilled Rune Priests who undergo consecrating rites in the most secret halls of the Deepflame clan become Rune Patriarchs. Their searing attacks hit their enemies and start a blaze that affects neraby units.
Thanes are not only great warriors, but also possess magical abilities. A Thane can teleport himself into his enemies' ranks, slaughtering them by brute strength with his axe. In addition, his axe fires off lightning bolts, striking nearby enemies. Thanes are immune to the element of Lightning.
The Warlords are Thanes who have dedicated their lives to mastering the power of mountain storms. Once per combat, a Warlord can strike a selected target and its neighbouring units with a powerful lightning bolt.
Fire Dragons are the children of Arkath, the Dragon of Fire and patron god of the Dwarves. Like their distant relatives the Black Dragons, these majestic creatures can attack their enemies with their fiery breath, and they respond to enemy attacks with splashes of Phoenix-like fire. The Fire Dragons themselves, of course, are immune to Fire.
Magma Dragons seem to have indeed been built from burning stone. Rock-like scales interlaced with fiery veins provide these ardent giants with nearly impervious armour.
This information comes from the Heroes V release version (v2.1).
Thanks to sfidanza for the work on this page. Thanks to Lord_Crusader for the pictures! Thanks to ThE_HyDrA for creating and looking after the Heroes 5 section of Age of Heroes!