What is fusion and how can I strengthen my creatures?

A. Fusion is the process of leveling your creature by combining it with other creature. To perform the fusion you need to:

• tap the "Fusion" image designated as circle on the bottom of the menu bar,
• on the top panel you can sort creatures by level, attack, health and race,
• choose the base creature (vessel) which you want to level up,
• then choose from 1 to 4 feeders
• tap the checkmark which will open the skylab, where you can see the amount of ether required for fusion process,
• tap "Fusion".

Some creatures approach the fusion process better than others.
Sometimes the fusion process can be improved.