Sorcerer Bloodline: Fortification

Here's the other bloodline I'm working on currently. :)
The 20th level ability seems weak to me.

Fortification Bloodline

At some point in your family history, an ancestor made a valiant stand in a besieged fortress against great odds, and eventually died when the fortress was destroyed or damaged beyond recognition. Since that time, the descendants have sometimes exhibited powerful defensive magic, particularly when defending castles and fortresses.

Class Skill: Knowledge (engineering)

Bonus Spells: alarm (3rd), arcane lock (5th), tiny hut (7th), secure shelter (9th), wall of stone (11th), guards and wards (13th), mage's magnificent mansion (15th), iron body (17th), refuge (19th)

Bonus Feats: Arcane Armor Mastery, Arcane Armor Training, Armor Proficiency (any), Dodge, Leadership, Mobility, Shield Focus, Shield Proficiency, Skill Focus (Knowledge [engineering]), Tower Shield Proficiency, Weapon Proficiency (any).

Bloodline Arcana: Your magic feels crisp and "military", often granting special defensive abilities. Any spells you cast that increase armor class improve their bonus (whether armor, deflection, shield, or natural) by +1. Locations or materials created by your spells take on a decidedly military appearance. The material's hardness is increased by +5. Structures created by your spells provide arrow slots or other defensive measures that provide total cover to those shooting from behind them.

Bloodline Powers:

Arcane Ballista (Sp): At 1st level, you can conjure a ballista in an adjacent space as a full round action. The ballista provides soft cover, but more importantly it can fire a ballista bolt once per round at a foe you designate within 30 feet as a standard ranged attack (using your attack bonus), dealing 1d4 piercing damage. Once a bolt is fired, a new bolt is conjured in the loaded position automatically. At 5th level, a conjured ballista is well shielded, and provides partial cover as a low obstacle if you are medium, or total cover if you are small. At 7th level, the damage increases to 1d6 damage. At 11th level, the ballista bolt's damage increases to 2d6 damage. You can use your ballista a number of rounds per day equal to 3 + your Charisma modifier.

Living Shield (Su): At 3rd level, any shield you bear seems to take on a life of its own so long as you hold it. It braces against oncoming attacks, providing an additional +1 shield bonus. At 7th level, and every four levels thereafter, this bonus increases by +1, to a maximum of +5 at 19th level.

Fortification (Su): At 9th level, you gain a magical ability to repair damaged structures, repairing 1d6 damage per sorcerer level. At 9th level, you can use this ability once per day. At 17th level, you can use this ability twice per day. At 20th level, you can use this ability three times per day.

Secrets of the Keep (Su): At 15th level, your base speed is increased by +20 feet while within a fortress or defensive structure. Once per day, you may teleport with no chance of error to any known part of a fortress or defensive structure you are currently in.

Shield Wall (Su): At 20th level, you are a truly defensive force. You can conjure a defensive wooden wall that provides improved cover with a length of 100 feet per day. This can be broken up over the day, but the minimum length is 5 feet. Any structures conjured by your spells provide improved cover instead of total cover. Finally, you gain unlimited use of your teleport ability while within a fortress or defensive structure.

Well, the powers seem decent, if a bit limited in scope. The ballista is an especially cute variant of the usual level 1 sorcerer attack variant. Living shield might be a bit powerful for a class that's already got plenty of defensive magic at it's disposal - the bloodline arcana is already pushing pretty hard on that.

What I'm having more trouble with is the concept in general. This doesn't scream bloodline so much as prestige class. I'd buy a 'warrior' bloodline, but to have "I defend castles!" stamped in your genes is a bit... wacky?

Yeah, it is... but then again, so was my Unicorn bloodline. I come up with a lot of wacky things. :P

In fact I'm generally allowing the sorcerer bloodline idea to evoke wackiness in me.

Okay, so the 3rd level ability and 20th level ability need to be changed. :) I'll think about it.

Replacements for 3rd level and 20th level abilities:

Rampart (Sp): At 3rd level, you can conjure a defensive wooden rampart structure within 30 feet as a full round action. This is a 10 foot-high rampart, 15 feet wide, and 1 foot thick. At 7th level, the rampart is made of stone instead, is 20 feet wide, and 2 feet thick. A rampart remains as long as you are conscious. If you lose consciousness, go to sleep, or go into a trance, the rampart vanishes and cannot be conjured again for 12 hours.

Stone Defender (Su): At 20th level, you gain damage reduction 10/adamantine, and spell resistance equal to your class level plus Constitution score. Any structures conjured by your spells provide improved cover instead of total cover.

Yeah, it is... but then again, so was my Unicorn bloodline. I come up with a lot of wacky things. :P

Not to mention my Ooze Bloodline! The very idea made some one become wierded out... I loved tha part the most!

Let's just face it. The sorcerer is the opportunity to go way beyond our comfort zones and create a magically themed class based on 9 spells and a nontraditional skill.

Wackiness is bound to happen. And that makes sense, since the sorcerer is the wackiest of the characters to begin with. :P