Life Force Collector
Collects 10% of the amount of elixor that your attacker spent on the troops they used in their attack against you. So if they spent 100,000 elixor on troops. The life force collector would get 10,000. There could also be a storage limit, like the other collectors. The %age and storage limit can be expanded with upgrades. This concept would make it less annoying to be attacked because you get something back. It also awards players with good enough defense to make the attack use more troops. Suggested specs: level 5 town hall, cost 500,000 elixor, space 3x3. Each upgrade gives you 10% more of the attackers elixor and doubles the storage limit.