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In Combat rules said: you must make a concentration check (DC 10 + the grappler’s CMB + the level of the spell you’re casting) or lose the spell.

But what is the grappler’s CMB include? Just initial CMB(Base attack bonus + Strength modifier + special size modifier)?
OR
Is initial CMB + feats and abilities bonus?

Serpent Mount (Ex): Instead of the usual choices for a cavalier’s mount, first mother’s fangs ride on giant riding constrictors. These use the statistics of the constrictor snake druid animal companion.

In Bestiary 6, titanoboa companion are legal for play for PFS.
So...Can First mother’s fang choices titanoboa companion as mount in PFS?

Hi~ Mark, I have a question about Cavalier's mount tricks.

Mount (Ex):The mount is always considered combat trained (which include attack, come, defend, down, guard, and heel).
These are extra tricks? And mounts can get other tricks based on their int? (such as a horse at level 1:combat trained plus other 6 tricks).

I was play a First mother’s fang, so got a constrictors as mount. But GM said it can only learn 3 tricks(1 int), so can't get combat trained...(same problem with Vermin Tamer, get a vermin companions as mount which mindless)

Thanks and looking forward to your reply.