Cordyceps Boar

Charge. If the boar moves at least 20 feet straight toward a target and then hits it with a tusk attack on the same turn, the target takes an extra 3 (1d6) slashing damage. If the target is a creature, it must succeed on a DC 11 Strength saving throw or be knocked prone.

Relentless (Recharges after a Short or Long Rest). If the boar takes 7 damage or less that would reduce it to 0 hit points, it is reduced to 1 hit point instead.

Sun Sickness. While in sunlight, the cordyceps has disadvantage on ability checks, attack rolls, and saving throws. The cordyceps dies if it spends more than 1 hour in direct sunlight.

Undead Fortitude. If damage reduces the cordyceps to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the cordyceps drops to 1 hit point instead.

Cordyceps Cap. Growing from the myconid body is a strange white stem ending in a small light gray cap. This cap is difficult to hit, swaying as the infected creature moves resulting in +5 AC to hit the cap directly. The cap has 6 (1d6 + 2) hit points. The cap naturally regenerates all hit points at the end of the round, this has no effect on the infected creature's hit point total. If the cap loses all of its hit points in one round, it lets loose a spray of white fungal spores and the infected creature is stunned for the round. All non-infected creatures in a 10-foot radius of the cordyceps must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant. On a fail, the creature takes 2 (1d4) poison damage. A cordyceps that has lost its cap in this way makes the Undead Fortitude saving throw with disadvantage.

Tusk. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 4 (1d6 + 1) slashing damage plus 2 (1d4) poison damage.