Secrets of the Serpent Temple

The portal has opened and a new world has been found. Settlers have moved on to find decent places to build new cities and towns. Your caravan has found such place near old and bizarre ruins, and has sent you to investigate them. Through the thick, foggy, forest you find a large, old statue of a strange serpent, and ahead there is a large building. Walking up the stairs and eyeing the serpent-relief doors, you await excitedly to discover the secrets behind them. Only question remains: how long will you survive in unknown territory? Can be played in English or Finnish. This is Dungeons & Dragons Next (or 5th) and with premade characters. If you want to create your own character beforehand, make it 3rd level, use only D&D PHB, and from uncommon races only half-elf and gnome are accepted. From optional rules only feats are used.