Patch Notes August 26th, 2020[]
The traits 
Fast and 
Slow that control heroes' Attack Speed got a permanent update:
Fast heroes now get -20% attack (reduction) and +20% skill boost.
The boost might be affected by Skill (not confirmed yet).- Slow heroes now get a +25% Defense boost in addition to the previously existing boosts
Like the ATK and HP boosts of the Slow trait the DEF boost is affected by the hero's Skill stat. At level 80 this results in a +27% boost without Runes.
The update also includes 
Grondar's 
Slow Poke (Attacks last, but Max Health and DEF are increased by [25%], and this Hero will also take no damage from the first killing blow. (Percentage is increased by Skill.))