Implement a timer, where a non-active players contribution gets lowered if they are afk.
Example
If a player doesn't contribute towards the Wilderness Flash Event for 10 seconds, they start to lose 1 contribution point / 1,000 damage contribution every 2 seconds.
This does two things:
- Stops multi-alters from farming cores and GP.
- Stops leechers from hitting their personal goal then afking the rest of the event.