A comprehensive guide about all of the possible debuffs and negative status effects you may come accross in the game of Hero Wars. If you have any questions, feel free to ask.
Edit: Forgot to mention that Daredevil can also cause a slow debuff, but she can reduce only movement speed and attack speed. In addition to that, Orion slows only movement speed with his Magnetic Field skill. Neither of those two causes the regular slow debuff typically used by the others, as their slow debuffs lack the typical visual cues.
Edit 2: Also Chabba's Swallow can be cured and prevented by the combination of Celeste's White Night and Limbo skills if Celeste is in her light form (or alternatively if Celeste transforms to her light form with her Two Fates skill) and if she applies it to the target of Chabba's Swallow.
Edit 3: Phobos' Trembling Hands skill also deals damage over time. His skill belongs in the unspecified damage over time effects.
Edit 4: Paralysis caused by Yasmine's Dance of Death skill also grants the affected target displacement immunity, similar to Andvari's Stone Grasp skill, for the duration of the skill. This feature is not shared with Phobos' Paralysis skill, making their paralysis effects slightly different from each other.
Edit 5: Magic Defense debuff caused by Merlin's Phobia de Magica! skill is only temporary, rather than indefinite. Merlin uses this skill without any player intervention at specific intervals, with similar visual cues to his Magnus Magica! skill.
Edit 6: It seems that Judge's Ion Cyclone skill is currently considered a debuff that deals periodic magic damage over time rather than an offensive magic damage spell like I initially thought it was, as it is blocked by Sebastian's shield (consumes one charge of the shield, regardless of enemy numbers) and purged by Celeste's and Nebula's purge skills. Whether this is a bug or not is currently unknown. (This is now outdated as of Judge's rework)
Edit 7: Yasmine's Dance of Death skill will choose a different target if the current target of Assassin's Mark is not attackable when the skill is ready for use, for example, if said target is using a skill that removes them temporarily from the battle (such as with Ziri's Shelter of Sands). Doing so will also reassign the Assassin's mark, meaning death is not the only condition for Yasmine's Assassin Mark to run out.
Edit 8: Jet reacts uniquely to silence, more details on it here: [ Ссылка ]
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