Attack Speed is what determines the order of your heroes' attacks. The speeds are Fast, Normal, and Slow, where fast Heroes attack first, then normal, followed after by slow heroes. Any hero that is not identified as 
Fast nor 
Slow by the corresponding Traits on their hero card is normal speed. Knowing the order of attack is important when you plan a Dungeon Raid or check out the The Tower of Pwnage.
Attack Order in PvE[]
In Dungeons all Fast heroes attack first, one by one as selected (left to right). Then all Fast enemies strike back. This is the fast speed phase of the round.
After that, in the normal speed phase, all normal heroes can do an action, followed by all enemies.
Last but not least, in the slow speed phase, all Slow heroes attack, followed by all Slow enemies.
Attack Order in PvP[]
In Raids and The Tower of Pwnage, defenders always go first but all Heroes and enemies take turns attacking. Like in PvE mode, every round has 3 phases: fast, normal, slow phase.
First, the first Fast defender attacks, followed by the first Fast attacker. Then, the next Fast defender attacks (if present and alive), followed by the next Fast attacker. If one side (attacker or defender) has no fast heroes, it's the turn of all fast heroes of the other side before the normal heroes have their turn.
The normal speed phase works the same, just for normal speed heroes. First normal speed defender attacks, followed by first normal speed attacker. Then next normal speed defender, followed by next normal speed defender, etc.
Finally in the slow speed phase, the slow heroes can perform their actions, one by one, first slow defender begins.
The Impact of Selection Order[]
Important: All heroes attack in order of their speed and their selection order, from left to right. If you select a team of
| Order of selection |
|---|
then the effective order in which your heroes' turn is (left to right):
| Order of attack |
|---|
because 
Shade and 
Hopper are Fast, 
Craw is normal speed (he has not a fast nor a slow trait), and 
Lord Zomm is Slow.
Read more in My Dungeon, How Targeting Works (The AI Explained).
The Impact of Debuffs[]
Revenge Attacks happen immediately after the attacker landed their hit.
Frozen and dead characters always skip their turn, while characters that suffer 
Paralysis can lose their turn.
The 
Slowed debuff makes the target slow and attacking last for a few rounds.
Classes by Speed (Chart)[]
| Slow (12) | ||||
|---|---|---|---|---|
 Rogue (0) |
 Warrior (1) |
 Caster (3) |
 Healer (1) |
 Tank (7) |
 Life Reaper Brom |
 Jin Lei Lord Zomm Yan Luo |
 Chief NubNub |
 Grondar Jumbeaux Kozar Bonebreaker Moriko Phenol Thoxian Stone Fist Underlord Thraxx | |