NHF – new heroes for Heroes V 3.1.

Several ideas for specializations have emerged:
Haven: the chance of joining Haven creatures increases by 20% (in the biography, you can write something like this: during the formation of the Griffin Empire, this character was an ambassador of the central government in rebellious or, at that time, independent duchies and negotiated their peaceful accession).

Inferno: the hero can sacrifice an allied hero (in essence, the hero is simply disbanded along with the army; the hero cannot be a demon or a Necromancer) and receive experience for it, for example, 400 * their_level.

Necropolis: if the hero kills 4 or more basic-level living creatures within a week, the growth of creatures of the corresponding level in the Necropolis castles increases by a certain amount, for example, by 50%, or a formula can be devised. (in the biography, you can write that the necromancer, realizing that he does not have enough dark energy and necromantic skill to raise all the dead, uses magic to send them to the castle, where local necromancers revive them and add them to the hire).

Dungeon: for every 3 artifacts in the inventory (it doesn't matter if they are worn or not), the hero receives +1 to magic. (in the biography, you can write that he learned to draw some magical power from artifacts and use it for his magical purposes).

Academy: the hero receives +1 to knowledge for every 2 levels; the bonus only works when he is in the castle. The main essence of the specialization is to forge better mini-artifacts than others; in addition, you can accumulate a considerable amount of mana. (in the biography, you can write that he knows how to manage city libraries better than anyone else, which gives him a bonus in cities).

Fortress: at the beginning of the turn, all mines that are within one turn's distance from the hero and are not protected by anyone come under his banner; if it is not possible to check the presence of mine protection, then it can be made so that all mines not belonging to neutrals are captured, so that the player cannot free protected mines at the beginning. (in the biography, you can write that the hero always agreed to take local engineers with him on adventures; in gratitude for this, they helped him save time on mines).