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The new archer upgrade (secret archers) for Ossir causes complete chaos in the enemy army's ranks! P.S. Sworn enemies die like flies (sorry for the boldness)!
Regarding the archers' low HP: to protect the archers, you need to use the right tactics in battle and level up your hero. I don't know about you, but my archers are rarely killed or blocked (mostly they take everyone out).
Sworn enemy is great. It's easy to predict the enemy creature if you're playing against... well, for example, if you're playing against the Dungeon faction, it's unlikely that the opponent will put many non-native creatures in their army, and where would they even get them? If you don't know who you're playing against, then of course, the tavern... But in general, how can the chance of guessing the enemy creature be very small? It's very high! If you're playing on a small map, it can be difficult due to the lack of the necessary neutral creatures for the spell.