Everything You've said works with me. Now, as long we get this thing made up and set in an orderly manner, I'll post the whole deal in a little post right beneath the accepted Char list.I believe other people's posts count as well XD and you have to 'design' that Rank 4 Minion first, to my knowledge that'll take 1 post dedicated to the designing process, if you haven't done it once already of course. judging from what I've seen in your posts so far there should be 2 Summoning points available I think. You can expend those points in one post, put when spending summoning energy you can't gain more in the same post.
So all together this process should take 2 or 3 posts, though aside form the 'designing' post, You can still interact, move, and so on, Best you make sure you can call yourself at least temporarily safe before starting the designing process.
And I was considering that actually, Adding in a little delay for the higher rank Creatures, a period where you can't summon more of that rank once you summon those, though you can still summon multiple ones at once if you have enough points to spend. For the most part though the limit on how many can be summoned and when depends on your flow of Summoning Energy.
The system is set up to allow for quick summoning based on a 'resource', that is summoning Energy points, S.E.P., The limit on how fast and how many you can summon of what depends on the flow of SEP, otherwise, other limitations can be set by the GM if he feels their needed =3
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I was actually using a multiplicative cost for the 'level upgrades', For a rank 4, level 2 would cost 2 Summoning points, the first upgrade is twice the summoning cost, then 4, then 8, and so on. That actually makes especially high upgrade levels inefficiently expensive, so it won't be easy to upgrade a huge army to a massive level XD =3 All systems have 'flaws' that may be overlooked by someone getting overzealous about upgrades XD
As for 'what' the upgrades give =3 you can decide that a bit, such as an 'imp' becoming a 'level 2 armored Imp', or gaining a slight enhancement to a weapon, kinda like how the imps in the overlord game can collect random equipment... I suddenly am reminded of the punkin paladin minion i once made XD haha
For the 10 minions he wanted to upgrade it would still only cost one point, and 1 point to make a single Rank 4 minion, unless he actualyl meant 'level 4' for one of his Imps, that would be different XD
Edit: Also @Rtron, The zombie RP is only missing your post right now before we progress =3
OH, once last thing, I was thinking of adding in a post delay requirement, like, you can't feasibly gain a resting bonus if you post literally 'every other post' like you must wait for 2 or 3 other posts before making your next one. If that makes sense =3 the more you want to recover, the longer you should be patient to get a couple of posts between your last ones XD though you still have to get into that resting state first XD