When the merc attacks an opponent, it choses from a table what to use, rolling a chance at multiple skills.
Aura level 'frequency' is always 10, normal attack frequency is always 30 and Jab level increases from 78 at level 1 (can't hire a level 1) to 175 at level 98.
It takes a bit longer at higher levels to activate due to the increased chance of Jab being chosen.
Once the aura has been selected, only normal attack and Jab will be rolled for afterwards.
The tables for each merc can be found here:
https://www.diabloii.net/forums/threads/ultimate-merc-guide-v3-0.306061/Quote (NeedUlikeAdrug @ Mar 22 2022 12:09pm)
Merc has a chance for normal attack, a chance for jab and a chance for activating aura with each attack.
Dunno the exact numbers but afairit is only something like 5% to activate aura so it will take some attacks for your merc to do so.
It works out pretty much to 5% at high levels.
This post was edited by piatek on Mar 22 2022 08:50am