The Summoner can be unlocked with the "witch hunt quest". You have to defend a random villager and solve the quest twice.

Random event after bounty(headhunter) event. He will challenge a hero of you.

Old man event. Let him stay in town to see the item (choose Option 1)

You need book of dead.
You can get it in area with undead: There will be a event to buy that book
or u get from black market npc(luck). Once you have the book, go to a area with graveyard and trigger grave robber event. (The graves need to be full) Give the grave robber the book.

To unlock the wizard, you need to have a giant brew(potion) in your inventory. In a very rare event, you can give away the giant brew(potion).

Go to an area with pumpkin farm. Upgrade your well through well upgrade event(it's glittering afterwards) Wait for the next random event.

You need to have the unknown potion(violette bottel with question mark) in your inventory and wait for an event to upgrade it.

You need to unlock the building(defense) trap. Wait for werewolf event and choose the Option use trap in your village.

There are two unknown heroes. Please help to complete the unlock guide!