The felldrake needs a 20 foot running start to have a chance, so it first moves to 110N90E.
Round 249: The mushroom turns around and moves to 110N60E10Z. The felldrake resists aftereffects of the spores (rolled 20 Fort save).
The felldrake runs to 110N60E and only gets up 4 feet (rolled 18 jump check).
Round 250: The felldrake cannot withstand the mind attack (rolled 12 Will save vs. DC 18). It takes 19 points of damage, leaving it with 32 HP. It does not withstand the spores (rolled 14 Fort save), taking 4 points of Dexterity damage. Its Dexterity is down to 1.
The felldrake moves to 110N20E.
Round 251: The felldrake succombs to aftereffects of spores (rolled 13 Fort save), going down to 0 Dexterity. The mushroom turns and moves to 110N50E10Z.
The felldrake does not move, so it is defeated.
Next in round 251 for Neutral Good is an Oceanus dragon wyrmling (Draconomicon).
Oceanus dragon wyrmling (Draconomicon). It has the feats Hover, Improved Natural Armor, and Iron Will. It has the following maxed out skills: Knowledge (History, Nobility, and the Planes), Listen, Search, Sense Motive, Spot, and Use Magic Device. It knows nothing about the mushroom other than what it has observed.