Adrenaline Level is separate from Adrenaline. When I kill a single unit stack with an orc unit, all of my orcs gain one adrenaline level. The number on the adrenaline ability increases sort of like the Mastery ability or the offensive ability on black knights to indicate adrenaline level.
Gaining Adrenaline levels also not only give you new abilityes, but also gives you a bonus at each level (+1 speed, then +5 attack, etc.)
Adrenaline (not level) appears to be sort of a per-unit resource that you can spend to activate an ability. You gain Adrenaline (not level) by doing things in combat with your orcs.
However, I have never been able to reach level 3 Adrenaline level. Kill one unit -> level one adrenaline level. Kill another unit -> level 2 adrenaline level. Kill more units -> no more adrenaline levels. The behavior of these skills and other things I have seen in Orcs on the march seem to imply that level 3 adrenaline level needs to be somehow unlocked.
In any case, due to a lack of orc supply and a desire to use other new units, I have stopped using orcs. I may go back to them later in the game.
Currently, I am using Engineer + Guard Droid + Repair Droid. Verdict: Engineers are so hilariously awesome. They are VERY expensive leadership wise and do very little damage per leadership, but their utility is COMPLETELY unmatched. Well.. I haven't tried the rune mage yet, but i'll get to that later when I have some spare runes.
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