In our current campaign we're skipping in-game time and a few levels for story purposes. With my eidolon becoming so much stronger my actual character seems more and more restricted to staying back and casting the occasional buff. Before this skip I used to stay next to him in combat and deal adequate damage with adequate survival. I'm trying to find ways to continue being a factor. My Eidolon is pretty much optimized.
The thing I've definitely decided on is making my eidolon a mount and specializing in mounted feats. This way we get all the benefits associated with being next to each other and I can do things like using Ride checks in place of his AC and saves in addition to always being in Touch range for spells. I can also use him as total cover when needed. I'll probably take the Skilled (Ride) evolution from Aspect for +8 Ride unless something else seems like a better idea.
The only problem is considering what should I be doing besides that? I've considered a few things.
1.) Multi-Weapon Fighting + Arms.
So, using a 2d6 two-handed with two 1d6 light weapons and Power Attack. That would require 3/7 feats I'll have at 12th level so 4 are left over for Mounted feats.
The problem here is that the damage won't scale. My strength won't be increasing that much (you guys tell me?), so while I'll be dealing an average of 60 or so damage/round with power attack (assuming I hit with everything), it won't be much compared to my eidolon or our other PCs. My Strength is currently 18 for +4, and I could cast Bull's Strength on myself. I don't really know how to increase it beyond that. Maybe enchanted items with +STR and enchanted weapons for +DAM? I don't want to dump feats into this if I'll just be outclassed at lv16+ when I could have done something else to be more effective.
2.) Lance + Spirited Charge.
It's a pretty obvious combo but it has the same problems as above. Assuming power attack at 12th level. Damage: 3d8+27+18 Average: 61.5 damage in a single hit. But after that one hit I'd have to sacrifice my Eidolon's damage output just for us to pull back and charge again. I guess I could combine that with #1 though.
3.) Being a Tank.
Basically, using a Shield and taking all the Mounted and Shield feats associated, increasing my eidolon's AC, and being sure to not take damage so I can give him health all the time. The problem is that its a lot of feats for a small gain and using a Shield gives spell failure (which isn't much in this case but would be really annoying). Plus, I wouldn't really be doing anything except sitting there.
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So anyone have advice or see something I'm not? Am I underestimating how much damage I could deal at lv20 with multi-weapon fighting and Power Attack?