Players get exhausted if they try to cast spells, runes or use potions in succession. In the case of spells and runes you will see a smoke puff on your character when you're exhausted.

These are the forms of exhaust:

• Offensive spells and runes cause exhaustion for 2 seconds when casting other offensive spells and runes, but not to defensive ones.
• Defensive spells cause a 1 second exhaust to other defensive spells and runes, but not to offensive ones.
• Defensive runes cause a 1 second exhaust to potions and other defensive spells/runes, but not to offensive spells/runes.
• Potions cause a 1 second exhaust to other potions and to runes, but not to instant spells.

For example;

• If you use energy strike you will have to wait 2 seconds before you can use it again. You can however still use for example light healing during the 2 seconds.
• If you use HMM you will have to wait 2 seconds before you can use another one. You can however still use for example light healing during the 2 seconds.
• If you use light healing you will have to wait 1 second before you can use it again. You can however use for example energy strike during the 1 second.
• If you use IH you will have to wait 1 second before you can use another one, or for example a mana potion. You can however use for example energy strike during the 1 second.
• If you use a mana potion you will have to wait 1 second before you can use another one, or for example a HMM.

It's important to note that not all spells fall into these categories. For example, one can cast both a haste spell such as, "utani gran hur" and a healing spell such as, "exura" within 1 second. This is particularly useful when facing several high level druids.