Skilltrees are the way to specify when which pet will unlock/upgrade which abilities.

You can think of skilltrees like classes for players (for example knight and archer).

Skilltrees (.st.json)

This is a skilltree file. Every skilltree has it's own file.


Any Ability has it's own custom option that can be set in the skilltrees.


An upgrade will change the settings of a skill. It can add a row to the inventory or add more damage. Every upgrade is applied on a level rule that determines when it will applied. An upgrade can be applied on fixed levels or on repeating schedules like every 3 level.


Skilltrees are capable of inheritance which means if skilltree a inherits from skilltree b, skilltree a will have all the upgrades form skilltree b and in addition to it's own upgrades.

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