Hi! I have idea, for new passive abilities (example on new crusader) :)

Hero: Priest, the guardian
1.) Invisible barrier (or Hold the door! :D) - On first contact pushback enemies by 50% distance, between their spawn and your front lane (1st column from right side). Bosses are immune.
//this is good for strategy, because longer distance, is longer pushback (= more time to kill)

2.) Dangerous storm - Every 10 sec Priest, the guardian hit random enemy with powerfull lightning. Lightning deal damage equal to 75% of their max health.
Lightning have crit chance (same as click dmg) - if lightning crit, it is instant kill for enemy.
Bosses take only 10% of their max health and lightning cant crit on them.

3.) Surprise activated! - Always, when use activate ability, which inflict damage or increase your DPS, fear all enemies. They are run back for 5 sec and lost 5% of their max health every 1 sec for 5 second. Bosses are immune.

4.) Revenge - Every time, when is your crusader killed, unleash confuse effect - enemies stop on place and fight between themselves for 5 second. Revenge cooldown is 45 second. Bosses not fighting under confuse effect, but they are waiting for rest their army - if is boss alone, Revenge is useless.

5.) Sunlight - Every enemy, which hit your crusader after pushback, recive debuff -50% attack damage for 5 second.

... OK, this is probably all for now :)