Marelt Ekiran
-Wet
Resistance: None
Effect: Actions +1 speed cost.
Causes: Swimming, D1 water, water creature attack.
Cure: Rest, dry spell (D1 fire or thermal).
-Frozen
Resistance: Cold
Effect: Actions +4 speed cost, 3d5+1, cold each turn.
Causes: Freeze spell on wet character, ice creature attack.
Cure: Rest, melt spell (D1 thermal).
-Disease
Resistance: Spirit
Effect: -2 speed and endurance.
Causes: Some attacks (mostly undead), spirit spells.
Cure: Cure disease spell (D2 body)
-Weakness
Resistance: Physical
Effect: -4 strength, -1 speed.
Causes: Some attacks, weakness spell (D1 body)
Cure: Rest, cure weakness spell
-Poison
Resistance: Physical
Effect: -3 endurance, -2 strength. Rest has no effect.
Causes: Poison attacks, gas traps, inflict poison spell (D1 earth + D1 body).
Cure: Cleanse insides spell (D4 water), antidote spell (D2 life).
-Fatigue
Resistance: Spirit
Effect: Reduces speed by 25% (mathematically rounded).
Causes: Spirit spells, some creature attacks.
Cure: Rest, cure fatigue spell (D2 body).
-Darkness
Resistance: None/Dark (if light drain)
Effect: -5 accuracy.
Causes: Dark places, light drain.
Cure: Torchlight (D1 fire), artifacts, darkvision attribute.
There are many more conditions possible, but those have specific spells connected to them. Their effects are described on the spells page. Remember that all of these conditions can be cured at a temple for a price.