Originally Posted by
Twilightwyrm
First of all, all the discussion of DM fiat, and this any discussion in this entire topic is essentially moot, because the scenario outright says this assumes a cooperative DM. Now, given what you are doing here is essentially breaking the game by level 5, I have a difficult time thinking any DM would be cooperative in this endeavor, and thus already we run into the problem that this is in fact reliant on DM fiat being on your side. Furthermore, at this point, why bother with your chain here? A truly "cooperative DM" will just let you find an unlimited Ring of Wishes, obviating the need for any of these shenanigans. So if we want any discussion, we need to assume a not necessarily cooperative DM, who can, and likely will, screw up your plan at every stage. Don't believe me? Well here are all the points in the process where a non-cooperative DM can completely shut this down (of, and for the record, never say "the DM can't do X", because rule zero, which is in fact RAW, says that they can)
1. You do not find a scroll of Planar Binding. No shops in your region sell them, and indeed there are no spellcasters available to hire to cast them. This is both the simplest solution, and actually a quite plausible one. 11th level casters are rather rare, and don't typically just sell Planar Binding Scrolls, due to the potential for abuse, so finding one is going to be exceedingly difficult, and probably beyond the reasonable scope of a 5th level wizard. (Unless the DM is cooperative, the Candle of Invocation is out entirely. Despite their relatively low cost, they require a 17th level caster, or the same alignment as the Solar, to make, and sell them, which are infinity more rare than even an 11th level one.)
2. You need to convince the Efreeti to cooperate. This will be MUCH more difficult than it sounds. The Efreeti initially gains a will save to resist being called at all, and since the minimum DC of a Planar Binding scroll is 19 (Any scroll you buy is assumed to have this unless otherwise states (And no, you can't "Just get one from a caster with a hilariously high modifier". You would typically have to seek out such an individual, and convince them to help you, an expansive quest in an of itself since you are essentially trying to find the most powerful conjurer in the land)), it has roughly a 50% chance of foiling the spell right there. Next, a single scroll of Dimensional Anchor will not work for this purpose, since it only lasts for minutes per level, meaning the Efreeti can simply Plane Shift out as soon as it ends. Further, the magic circle only works for 50 minutes, so unless you keep on casting it over and over, it will be essentially pointless. (Not to mention there are a number of combinations of the Efreeti's SLAs that can get it out regardless) And the Efreeti WILL NOT be cooperative, and likely hostile, and moment it finds out it has been summoned by a creature markedly less powerful than itself, which it WILL consider personally insulting (Lawful Evil alignment + described as being incredibly arrogant = this). So assuming you don't have an unnaturally high Charisma modifier, you have a very good chance of losing the opposed Charisma check, meaning you now need to actually convince it to help you, without any aid from the spell.
3. You mentioned offering him 50000 gold for a wish. This will not work for two reasons: 1) According to the WBL guidelines, you do not have this much money, and will not have it for another 5-6 levels and 2) Unless you got a down-on-his-luck Efreeti, this will be a paltry reward, from a comparatively weak individual the Efreeti is already hostile towards, considering Efreeti live in a city with a treasury describes to hold more money than exists in the kingdom, and likely the three surrounding kingdoms, combined. The DM can just give you a member of Efreeti nobility, ensuring this will be the case, and increasing both its arrogance and its tendency towards seeking revenge later on. Further, once the Efreeti actually hears the wish (to summon a Solar), it will be even less inclined to fulfill this wish, as it both likely hates solar, and recognizes the extreme threat to itself that such a being poses.
4) This is most important, because it means this plan is impossible by the RAW: Wish cannot replicate the Gate Spell. Wish can only replicate spells of 8th level or lower, and Gate is 9th. Even a cooperative DM, by the RAW you were so happy you were so happy to note, cannot allow you to proceed further here. So, unless you want to resort to Greater Planar Binding, which will have all the problems I mentioned turned up to 11 (since the Solar will note that you summoned it hear via Efreeti, which will leave it unfriendly at best).
5) Also important to note, again because this part of the plan is impossible by RAW: Even if Wish could acomplish this, you are relying on the Efreeti to make it for you. A Solar has 22 HD, meaning it has more HD than twice the Efreeti's caster level, meaning the Efreeti cannot, by RAW, control the Solar with a Gate spell, meaning you are screwed.
6) Even if both these things could be accomplished, you are now relying on a Solar to make your wish, and the solar is under the control of the DM, meaning it can mess with your wish at this stage. (Reason: Doesn't like you, due to aforementioned summoning if it with an Lawful EVIL Efreeti) And even if you were to convince it to grant you a wish, you are still compelled to offer it a fair trade in return for its services. You are wishing for an item of near unlimited power. There is no possible service or item you can currently offer the Solar that would be a fair trade for such an item, especially, and the Solar would not be inclined to be lenient, as it would deem you unworthy of it, even if you were Lawful Good, due to your incredibly low level, which would make leaving it in your hands a liability.
7) Finally, even if you could convince the Solar to grant you this, the DM can disallow it within the wish spell. Yes the wish spell does say "create a magic item, or add to the power of an existing one" and yes, as you have noted, this is relatively broad and vague. Therefore, as per the DMG, it is up to the DM to rule the specifics regarding it, meaning your DM CAN rule that this is impossible. Yes, there are rules for creating magic items, but there is also nothing saying, or not saying, you can use these items in the context of making a wish, as it says "Create a magic item" not "Create any magic item". Wherever there is ambiguity in the rules, the DM, and not YOU, gets to define the limits and extant of what they allow. So really, this just ties back into what everyone else here has been telling you: this relies on DM fiat regarding the Rules As Written, and therefore you can't do this in spite of the DM.
Final Note: Even within the Rules As Written, there is very little even a reasonable DM cannot prevent you from doing, ESPECIALLY when it comes to the Wish spell.