When the Archon acquires the skill Archon's Blessing 2, the skill can be cast on the Archon itself.  This immediately gives the Archon another turn, refreshes the Archon's Blessing ability so it can immediately be cast again, and gives the Archon a stacking buff to attack and initiative.  This can be stacked an indefinite number of times, effectively making the Archon arbitrarily powerful and fast.

A few side notes that are confusing- the Dwarf Lord has an ability that says that it can dual wield axes, but either that isn't functional or is an inbuilt trait of the hero (Is that why he can reroll missed attacks?)  There are some other confusing elements too- the Twisted Magi (also Pariden) is described as being able to throw lightning and has the 'flaming arrow' ability, but has a melee attack... it's rather confusing.  Finally, the Ranger hero's ability that allows all friendly archers to have one free shot at the start of each battle appears to consume that archers' turn to do so.  This can often be rather annoying, as it means that the archers won't get to act again for a long time, and means that the hero needs to wait a long time to use any actual abilities.  To be honest, there appears to be quite a few significant bugs in-game.... (plus the tactical AI/enemy AI in general doesn't appear to be brilliant).  *Additionally, the Paladin is described as healing 4/turn in combat, but doesn't heal at all- I suspect that this is a mistaken tooltip, and it actually heals 4 per turn on the world map?

Side question- is there anything that I can usefully do with old/spare weapons?  I have like 8 different low-level swords that are mostly either clones or inferior to my 1 sword-wielding hero, etc.  Is there any way to break down weapons or trade them or do anything useful but sitting in my inventory?