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Dimetrodon

osric

osric
FrequencyUncommon
Number appearing3d6
Armor class7
Move90-ft
Hit dice7
% in lairNil
Damage per attack1d10
Special attacksNone
Special defensesNone
Magic resistanceStandard
IntelligenceNon-
AlignmentNeutral
SizeLarge

Dimetrodon is technically a synapsid, and is anachronistic here by quite a large number of millions of years, being more separated from Tyrannosaurus in time than 21st century humans are. It had a huge "sail" on its back that may have helped it regulate its temperature.

Source: OSRIC. Attribution: Stuart Marshall, with Matthew J. Finch / Black Blade Publishing. License: OGL-1.0a.