So we have daily missions that we can only complete once every 20 hours. Why don't we have a Weekly missions that we can only do once every 164 hours?

After receiving some wonderful feedback from a high rank friend I have a bit more of a fully formed idea on how the costs could be worked out as well as how the bonuses could scale.

A performance based bonus with mission cost that scales by player rank. And ungrays once the minimum performance benchmark is obtained in the past 7 days AND only if the player is not currently under the effects of the buff.

Proposed cost for weekly mission completion would be rank*4 and increase every 50 ranks giving a 1:1 XP ratio. 10 rounds to completion.

So for a rank 350 it would cost 140 energy a round and 1400 energy per completion. Rank 400 it would be 160 per round and 1600 per completion. Rank 1k it would cost 400 energy a round and 4k energy for a completion.

For the bonus it could scale based on performance in both PvP AND NPCing and scale by rank in tiers of 25 ranks. With multiple possible bonuses depending on that players performance during the week.

For a rank 1k the performance benchmarks could be:

1000 NPC kills, 20 PvP targets disabled for a 1% bonus to attack.
2000 NPC kills, 50 PvP targets disabled for a 2% bonus to attack.
3000 NPC Kills, 80 PvP targets disabled and 1 planets invaded for a 3% bonus to attack.
4500 NPC kills, 120 PvP targets disabled and 2 planets invaded for a 4% bonus to attack.
6000 NPC Kills, 160 PvP targets disabled and 3 planets invaded for a 5% bonus to attack.

At rank 350 the benchmarks would be far lower and could be:

200 NPC kills 5 PvP targets disabled for a 1% bonus to attack.
400 NPC Kills 10 PvP Targets disabled for a 2% bonus to attack
700 NPC Kills 15 PvP Targets disabled and 1 planet invaded for a 3% bonus to attack.
1100 NPC Kills 20 PvP targets disabled and 2 planets invaded for a 4% bonus to attack.
1500 NPC Kills 30 PvP targets disabled and 3 planets invaded for a 5% bonus to attack.

Nice idea and has potential if balanced right

I'm hoping to work on the idea more as I get feedback from people on it. I was thinking it could be geared for balance towards players rank ~350 and up.

Completion cost I came up with off the top of my head was around 2100 energy per completion which would be totally doable for near anyone around that rank. Crimson Obelisks seems a good fit for the Drannik flavored weekly though I'm not sure about the other 2.