That'll work for me!
How about making the next feat Power Attack?
CR 5 looks ok. By eyeball, they're probably roughly on par with the Medium Adult Tojanida.
Updating the
Afanc Working Draft.
Upon reflection, I'm wondering whether the Advanced Young Afanc trigger should be Hit Dice not Huge Size (i.e. "If an afanc advances to 9 Hit Dice" instead of "If an afanc advances to Huge size" since then if you
reduce a Huge adolescent afanc or
enlarge a Large young adult its Capsizing Collision ability doesn't disappear.
I believe the ability is due to the maturing afanc's head growing increasingly tough, eventually turning into the battering-ram like snout of the adult. Shrinking an adolescent would reduce the size bonus to +4.
Let's see, what would that look like…
Advanced Young Afanc
If an afanc advances to 9 Hit Dice it gains the Capsizing Collision special attack described below.
Capsizing Collision (Ex): As a full-round action, a submerged advanced young afanc can swim up to double speed (80 feet) and crash into a waterborn target. The afanc must move at least 30 ft. and end in the target's space. This attack deals 2d6+10 points of damage (1d8 base damage if Large). If the target is a creature it can attempt either an attack of opportunity or a DC 24 Reflex save for half damage. The save DC is Strength-based.
If it crashes into a vessel, the afanc makes a Strength check (+8 size bonus if Huge, +4 if Large; total modifier +18 for a typical Huge young afanc) against a DC based on the vessel: rowboat DC 18, launch* DC 26, keelboat DC 30, sailing ship or longship DC 38, warship DC 42, or galley DC 45. If the Strength check succeeds, the collision does an additional 2d6 damage (4d6+10 in total; Large young afanc do an additional 1d8 instead), and the afanc then make another Strength check with a –4 penalty (typical modifier +14, same target DCs). If the second Strength check succeeds, the vessel capsizes.
*Launches are described in Stormwrack.
Ugh, that's messy.
Upon reflection, it's easier retaining the current ability and just adding the line:
Should an advanced young afanc with 9 or more Hit Dice be Large size the collision damage is 1d8 + Strength modifier. It has a +4 size bonus on the Strength check against vessels and does an additional 1d8 damage if it succeeds. Medium size or smaller afanc cannot perform capsizing collisions.
Updating the
Afanc Working Draft.
How about making the next feat Power Attack?
Works for me.
How about Endurance, Improved Multiattack for the adolescent's third and fourth feats?
CR 5 looks ok. By eyeball, they're probably roughly on par with the Medium Adult Tojanida.
I reverse-engineered it two size steps (–2) and 10 Hit Dice (–3) down from the Adult's CR 11 and then knocked off another –1 CR since it's special attacks are less effective.
To me it eyeballs more like a CR 4.
Just compare it to, say, a CR 4 Rhinoceros (which is notably tougher!) or CR 5 Troll (more hp, higher damage, plus regeneration).
The Tojanida has similar hp, but considerably harder Armour Class (AC 23 vs AC 16) and does twice as much damage (2d8+3+2d6+2 vs 1d8+6 or 2d4+6 averages 21 vs 10.5/11).
That suggest the adult might be a CR 10 rather than 11, with the young CR 4 (I'd keep the Huge adolescent at CR 7).