Umbog (5e Creature)
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Large giant, any non-lawful alignment (usually neutral evil)
Innate Spellcasting. The umbog's innate spellcasting ability is Wisdom (spell save DC 10). It can innately cast the following spells, requiring no material components:
Multiattack. The umbog makes two attacks: one with its claws and one with its greatclub.
Claws. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 12 (2d8 + 3) slashing damage.
Greatclub. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 12 (2d8 + 3) bludgeoning damage.
Change Shape. The umbog magically polymorphs into a beast that has a challenge rating equal to or less than its own, or back into its true form. It reverts to its true form if it dies. Any equipment it is wearing or carrying is absorbed by the new form.
Cumbersome green-skinned giants that can innately use magic and transform into animals, umbogs are swamp-dwellers that feed on just about everything. A group will eke out a large territory, often covering a large swamp or bog, then they drive off any competition and devour any intruders that ignore the obvious markings they place at the edge of their territories, spying on them in animal forms. They sometimes capture creatures instead of killing them, then they interrogate them, usually by threatening to eat them if they don't tell them everything they want to know, but usually, their demands are mundane.
Giant Leaders. Umbogs only respect other giants, especially true giants, and constantly vie amongst themselves and other giantkin for the favour of even the lowest of true giants. They rarely, if ever, hold concern for the laws and customs of others, doing as they please. However, compared to most other giantkin, umbogs are far more intelligent and personable, and given their innate magic, some umbogs act as leaders in tribes of less intelligent giants, while others fill roles where their intelligence is useful in others, particularly when they serve hill giants.