Endings

Portals of Phereon has multiple endings, some exclusive to each character.

Evolution Default Ending
How to Obtain: Simply play through the game as Evolution. For the bonus part of this ending, you must complete the all main story event portals that appear in order to get the required weapons to save Siena.

On day 30 (or whenever you chose the game to end), enter the final portal and fight your way through the various battles until you hit the far right side of the map. Unlike most other event portals, you will have two boss fights at the end instead of just one: the first against Creation/Siena and the second against the Druid/Viridion. Upon fighting Siena, if you've previously picked up the cleansing staff in the earlier event portals as part of Evolution's story, you can use the staff's special ability on Siena to free her from the curse if her corruption is low enough (corruption can be lowered by fighting and destroying hives that appear in existing, non-event portals over time), which will split her off of Hebi (who will spawn nearby as a regular enemy) and cause Siena to join your team permanently. Upon completion of this battle, the Druid is next. If Siena has been recruited, it may be wise to equip her with any equipment you're carrying, as she won't survive many (if any) hits against the Druid and his minions but she does provide some useful support skills. Upon defeating the druid, Evolution is given three different options that she may pick from upon finding the mana crystal which mostly provide a flavor for the ending.

Creation Default Ending
How to Obtain: Simply play through the game as Creation.

Druid Default Ending
How to Obtain: Simply play through the game as the Druid.