The Eidolon in my game has driven me crazy. Its defense seems unbreakable.
Let’s see a Level 5 Biped Agathion (HD4), with Naturalist Archetype, who has enslaved a half elf to provide him endless power.
With 3 Extra Evolutions and favored class bonus, the Agothion has 8 Evolution points, which can be allocated as follows: Improved Natural Armor*2, Fire Resistance, Energy Attacks, Claws, Limbs.
The Agothion has learnt some skills about Combat Reflex, Power Attack, Dodge
Now, WITH NO EQUIPMENT, the Aagthion has 33 AC(+10 Natural, +2 Dex, +1 dodge, +4 Mage Armor, +4 Shield, +2 Barkskin), while according to the monster creation rules we know a High Attack CR 7 monster ONLY has +13 attack, which means the Aagthion is nearly immune to any attack that targets AC.
And with the help of Resist Energy: Acid, the Aagthion has 10 Resistance to any energy attack, so things like FireBall, Alchemist’s Bomb can be of no help.
Also, we know Biped Agothion has a good fort save and a good will save.
The most crazy thing is, even if I manage to do enough damage to the Aagthion, its master can share HP with him through Life Link, and with the help of Fervor juice, the Aagthion just continues fighting.
Don't forget Summon Eidolon. A scroll can make all my effort in vain. I believe a rod of quicken spell, lesser, can be a nightmare.
So every times the team encounter something, the master just casts shield and stay out of sight, and leave the Aagthion to finish all the monsters. And with 4claws +9 1d4+1d6acid+5(str+2 from animal focus), the Aagthion is doing a goodjob.
Any ideas?