In other post ppl go on about how good kaspar is because off his first aid tent, ppl argue that he is even better then vladimir who starts with raise dead.
Now when do you benefit the most from kaspars first aid tent? Well the first weeks mainly. Why is it so good? It lets you limit your losses, often you can even get out of battles without loosing a single unit.
How is kaspar special? Well he has the first aid skill to begin with. Other then that his first aid tent functions the same way as everyone elses (he gets a bonus/lv but for those first weeks where first aid matters the most I think it can be overlooked since he wouldnt have high lv)
One of my favorite heroes is Deleb. Her ballista speciality is wicked. It lets you deal with alot off neutral creatures without losses, using gating and ballista wisely. To get most potential out off it max the ballista and war machines skill as fast as possible dont take anything else. The ballista will now shoot two arrows with AoE damage wich you can controll.
Now in the process "waste" one level and choose first aid, preferably as soon as possible. Hard choice between ballista and first aid hopefully they dont show upp at the same time
Now you have a "kaspar" with a ballista that deals about 350 damage (some off it AoE) at lv 8-10ish. And a first aid tent that can heal 100 hp 3 times. that = 75 imps or 23 horned overseers or 20 hell hounds each fight.
[Edit: I just got my ballista to deal 240dmg at lv 4 ]
Late game the first aid tent wont be super I agree however "waste" one skill at catapults and for deleb you can get brimstone rain aswell. That will crush enemy towers and save you alot of succubi right there.
First aid isnt only for kaspar to use. Its a great ability to ensure minimal losses the first month while getting mines etc. In combination with ballista it might be a very neat skill.
I think that a player playin kaspar probably could benefit alot getting the ballista skill and I know that some sylvan heroes or the entire faction? Havent played them yet have a benefit with ballista they should also utilize their warmachines skill to the max and bring a first aid tent.