You cause yourself to grow larger or smaller for the duration. If you attempt and fail any strenuous task (for example, anything requiring a STR or DEX check (except Sneaking) or any Saves, casting a spell in combat, fleeing an area, etc), the spell ends. If a hostile creature attempts to attack you, the spell ends.
Everything you are wearing and carrying changes size with you. Any item dropped by by you returns to normal size at once.
Enbiggen. Your size doubles in all dimensions, and your weight is multiplied by eight. This growth increases your size by one category-- from Medium to Large, for example. If there isn't enough room for you to double your size, the spell fails. Everything you are carrying also grows to match your new size. Your carry weight is doubled.
Tinify. Your size is halved in all dimensions, and your weight is reduced to one-eighth of normal. This reduction decreases your size by one category--from Medium to Small, for example. Everything you are carrying also shrinks to match your new size. Your carry weight is halved.
* - (a pinch of powdered iron)
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