I think its a great idea that you're finally removing this CK. its probably annoyed me more then any other bug / balance issue (ch.4 epic boss excluded
).
keeping with the theme you requested, here are some ideas of the top of my head. The numbers can of course be tweaked, i'm just trying to provide some concepts which you may be able to use.
Suggestion 1: Every attack gives hero
x% chance to hit the enemy with (Magic Dmg x 1.5) as physical damage
or pure damage (damage cannot be reduced by armor), whichever seems more suitable.
Each level increases percentage chance by 5%.
Suggestion 2: Every attack gives hero
x% chance to go into a bloodlust that increases attack speed by 150% for
y seconds.
Each level increases percentage chance by 3% and duration by 1 second. first level gives base duration of 2.5 seconds.
Suggestion 3: Every attack gives hero
x% chance to get
y% lifesteal on the next attack.
Each level increases percentage chance by 3% and lifesteal by 10%. first level gives base lifesteal of 40%.
Reasoning: wanted to propose potential CK's that can be used by all three heroes and aren't just suitable on Fradz (though i definitely think you will have to make modifications considerably more significant then a new CK or two in the final version(s) to increase the viability of Phodom and/or Galeoth as prospective DPS heroes).
If the CK's seem powerful its because beserker and i'm guessing the eventual replacement CK will cost 3 honor points per level so it should be worth the cost.