Tree Form

Version 0.13: This article may not be up to date for the latest stable release of Crawl.

Tree form is a bad form that can be inflicted on the player by the polymorph other spell. Its most notable feature is that it entirely prevents the player from moving, but not from otherwise acting. In most other respects it is similar to Statue Form, although its effects are generally more pronounced. While transformed into a tree, the player gains the following attributes:

Pros

• +50% HP
• +20+0.5×XL AC (+33 AC at level 27)
• 48% GDR
• +10 strength
• Unarmed Combat base damage is set to 12
• Bonus to to-hit
• Huge size (immunity to most types of constriction)
• rPois
• rN+++
• Torment immunity
• Stealth modifier is set to 27 (very high; from a comment in the source code, the player is "masquerading as scenery")
• The player's hunger is set to Satiated (gaining nutrition from the ground via their roots), and they don't hunger
• Worshipers of Fedhas get rF+ and rC+.

Cons

• The base cost of all actions is increased by 50% to 0% depending on your experience level
• Cannot move, but can cast spells, use abilities, and attack
• EV is reduced to basically nil: (2 + size_modifier/2 + EV from Repulsion Field mutation, the same as when you are paralyzed)
• Cannot teleport
• Cannot fly
• All equipment other than shields, weapons, and helmets are melded.
• The player cannot eat or drink

History

In 0.14 it won't slow the player, and the potion of lignification will be added.

Prior to 0.13 it could make you vulnerable to fire, and the AC bonus and the speed penalty didn't depend on XL.

Like most bad forms, this was added in 0.12

Tree Form