Question about Stat scaling

Hi, sorry if this has been answered already but got a couple of questions regarding how stat scaling works.

Bascially, I had my Scyth at regular +15 and its scaling bonus addition was around 240 ish and before that was going up by 5 or so each time. Well recenty due to a good PvP match I was able to jump up by 10 SL at once and expected the scaling bonus damage to go up by 50 but it didn't, it only went up 10 or 15 or so.

I suppose my question is; does the scaling damage increase per dex stat reach a cap as your dex increases?

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My second question is, am I right in thinking the only factor that determines how strong magics are (soul spear, soul arrows etc) is the magic adjust of your catalyst? So a magic adjust of say 180 would hit the enemy with 180 magic damage only?

I've been playing this for a while but was unable to work out exactly the mechanics of certain game aspects, any help would be apreciated

First question. Yes, str/dex/int/fth cap. dex and str cap at 40.

Second question. No. I have no idea of how the mag ad of a cat increases the damage of a spell. I only know that more mag adj = more damage. And that some spells have more base damage than others.

What Spur said for Str and Dex.

Fth and Int continue steadily boosting your adj. all the way to 50 (IIRC). Adj is the core behind the damage of your spell, but each spell calculates its damage differently based on that. It might be 2x, or 4x or what have you, and then of course you have to apply the enemiea defwnse stat.

As an additional note, Dex increases casting speed up until 45.