Quote Originally Posted by Amnoriath View Post
1. But there isn't any "sorcerer" slot tree as it is just a full caster tree. The multiclass rules make that clear. Well of course Warlocks don't as they aren't a full caster. The point a Bard with any MAD could use this.
Nnnnope. You calculate spells known and prepared by class, not by character or evel slot level, so you would need the proper sorcerer level to prepare rune mage grafts beyond 1st level. Additionally, the ability specifies that to use a graft, you must "Replace a graft you already have of the same level." So unless you have enouh levels in rune mage/ sorcerer to already have a graft of the right level, you cannot just use or make grafts of a higher level than you can cast.

2. That is roughly equivalent to a second-third level spell. Remember they can sacrifice spell slots for them as well. I am just pointing out that they have access to 2 large lists and it doesn't cost any resources.
Actually, to use anything from those lists it requires quite a few large resource expendatures.
1. It takes 30 minutes/ spell level to graft a new spell, which is luxury down time within most dungeons, but hardly the biggest cost.
2. They need to find a scroll of the spell they want. Remember, there is no convinient magic mart they can just waltz to and buy whatever scrolls they want to in this edition, scrolls are rewards that are found in dungeons. Technically you could try buying some (a magic mart system is given in the DMG), but then you will not be able to buy level 7-9 scrolls as they are legendary rarity, and thus explicitly not sellable/ for sale, level 4-6 scrolls are sold for 7-50,000 gold, so good luck affording that, and level 1-3 are... Relatively cheep, actually. Level 1's are 50-250 (dm discretion) and level 3's are 1,000-2,500 (again, DM discretion). So you might have a few level 1-3 grafts to swap around, 2-3 level 4-6 grafts per level, and if you are lucky enough to find scrolls in the dungeon you might have 2 level 7-9 grafts in you possession by level 20*.
3. Additionally, if you are finding scrolls in a dungeon/ buying them in town, then you are actively competing with a party wizard for class resources. And your wizard will likely get first dibs, as they still have more spell prepared at the start of the day, and they can prepare multiple spells of the same slot level instead of just being limited to 1+1 unchangabe spell.
4. It does cost sorcery points, meaning that there is a literal "at the moment" cost to using rune exchange. If the sorcerer sacrifices a relatively useful spell slot (level 3 spells have quite a lot of variety, and can still pack quite a punch at level 15+), a prepared graft and their action for the round to get a new graft readied, then the sorc will be sacrificing versatility and the action economy for versatility. I don't quite see what the problem with that is?

*Grafts possessed are/ spell level.