Vipers are the most powerful snakes which you can find in Castaway 1. They are located in Glacier Ridge, also one viper guards the swamp generator. Vipers are poisonous, so one should be careful when dealing with them. The skin is worth 40 gold. The eggs hatch at level and are actually pretty rare.
Here are the statistics:
Viper Statistics | EXP gotten from defeating snake | Heart points on snake |
Level 15 | 228 EXP | 470 |
Level 16 | 259 EXP | 500 |
Level 17 | 292 EXP | 530 |