pf2e.fyi
From Pathfinder Impossible Magic, which isn't enabled.

Reinforce Eidolon

CANTRIP 1
UNCOMMONCANTRIPCONCENTRATESUMMONER
Cast
Range 100 feet
Targets your eidolon
Duration 1 round

You focus deeply on the link between you and your eidolon and reinforce your eidolon's defenses. Your eidolon gains a +1 status bonus to AC and saving throws, plus resistance 1 to all damage equal to half the spell's rank (minimum 1).

Special Your eidolon can benefit from either Boost Eidolon or reinforce eidolon, but not both; if you cast one of these spells during the other's duration, the newer spell replaces the older one.

Spell Effect: Reinforce Eidolon

Pathfinder Impossible MagicORC