Kardel uses his dwarf engineering skills to make modifications to his rifle, enhancing the range of his rifle.
Level 1 - Attack Range +65.
Level 2 - Attack Range +130.
Level 3 - Attack Range +195.
Level 4 - Attack Range +260.
Level 3 and 4 of this skill allow Kardel to out-range towers.
what it does is uses a trigger when the hero learns the appropriate skill, to upgrade the current level of a specific upgrade which adds to any unit with the appropriate techtree requirement's range.
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.