Wikipedia Trails: from Chimera to Elysium

1. Chimera
• A hybrid creature in greek mythology 
• able to breathe fire and located in Asia Minor
• usually depicted as a lion with a goat head on its back and a tail that ends with a snake's head 
• is the sibling of Cerberus and the Lernaean Hydra
2. Lernaean Hydra
• serpentine monster in greek and roman mythology 
• located in lake of Lerna, the entrance to the underworld 
• possessed many heads that would regenerate 
• had poisonous breath and blood that even the scent was fatal
3. Greek underworld
1. the place where souls go after death 
2. has a few main rivers
1. the styx, representing hatred
2. the archeron, representing pain
3. the lethe, representing forgetfulness
4. the phlegethon, representing fire
5. the cocytus of wailing
6. the Oceanus that encircles the world
4. Elysium
1. the place where souls that were related to gods and other heroes go to rest 
2. it was the place where the dead who were righteous, heroic, and chosen by the gods could remain after death to live a happy and blissed life
3. basically, paradise

Art of a hydra. 

Source: Animal-Dream.